Wednesday, July 8, 2020

[paper] compact nanowire JAM-MOSFET model

Kamalaksha Baral, Prince Kr Singh, Sanjay Kumar, Manas Ranjan Tripathy,
Ashish Kr Singh, Sweta Chander and S JitA
2-D compact DC model for engineered nanowire JAM-MOSFETs 
valid for all operating regimes
Semiconductor Science and Technology, Vol. 35, No. 8

Abstract: This manuscript reports a 2-D compact analytical model for DC characteristics under all possible regimes of operations of a cylindrical gate (CG) nanowire junctionless accumulation mode (JAM) MOSFET including the effects of various device engineering techniques. Superposition technique with appropriate boundary conditions has been used to solve 2-D Poisson’s equation considering both free/accumulation and depletion charges. The minimum potential concept has been used to conceive the threshold voltage formulation considering the effects of structural and electrical quantum confinements. An optimized device model has been formulated incorporating various device engineering. The potential model could also be used for potential modeling of doped inversion mode MOSFETs. Complete drain current including gate induced drain leakage (GIDL) has been derived from the potential model. Drain current has been derived individually for different regions. Further the effects of temperature and trapped interface charges have been included in the model. A 3-D commercial TCAD has been used to validate the model results of our proposed device. 
Fig: A 2-D cross-sectional view of cylindrical gate nanowire
junctionless accumulation mode MOSFET 



Tuesday, July 7, 2020

[mos-ak] [Final Program] MOS-AK Workshop at ESSDERC/ESSCIRC,Grenoble, Sept.14, 2020

Arbeitskreis Modellierung von Systemen und Parameterextraktion
Modeling of Systems and Parameter Extraction Working Group
MOS-AK Workshop as ESSDERC/ESSCIRC Virtual Educational Event
Grenoble, September 14, 2020

Together with local ESSDERC/ESSCIRC Organization Team as well as International MOS-AK Board of R&D Advisers and all the Extended MOS-AK TPC Committee, we have the pleasure to invite to consecutive, 18th MOS-AK Workshop as ESSDERC/ESSCIRC Virtual Educational Event

Scheduled, subsequent 18th MOS-AK Workshop organized as an integral part of the ESSDERC/ESSCIRC Confernces, aims to strengthen a network and discussion forum among experts in the field, enhance open platform for information exchange related to compact/SPICE modeling and Verilog-A standardization, bring people in the compact modeling field together, as well as obtain feedback from technology developers, circuit designers, and TCAD/EDA FOSS and commercial tool developers and vendors. 

MOS-AK Workshop Program
includes 8 webinars by the internationally recognized compact modeling experts: 
W_1 Qucs-S and QucsStudio for compact device modelling.
Mike Brinson
London Metropolitan University (UK)
W_2 Memory Modeling for Neuromorphic Computing
Mansun Chan
Hong Kong University of Science & Technology (HK)
W_3 Compact Modeling of Oxide and Organic Thin Film Transistors
Benjamin Iniguez
Universitat Rovira i Virgili, Tarragona (SP)
W_4 Latest developments of L-UTSOI: 
A compact model dedicated to low-power analog and digital applications in FDSOI technologies
Sébastien Martinie
CEA-Leti, Grenobel (F)
W_5 Overview of the ASM-HEMT Model
Yogesh Chauhan
IIT Kanpur (IN)
W_6 ngspice - current status and developments
Holger Vogt
Fraunhofer IMS, Duisburg (D)
W_7 LDMOS compact modeling and the PSPHV model
Kejun Xia
NXP (USA)
W_8 Nanowire Junctionless ISFETs
Ashkhen Yesayan
Institute of Radiophysics and Electronics National Academy of Sciences (AM)

The MOS-AK program is available online: <http://www.mos-ak.org/grenoble_2020/>

Venue:
Virtual Educational Event at ESSDERC/ESSCIRC  
 
(any related enquiries can be sent to registration@mos-ak.org)

W.Grabinski on the behalf of International MOS-AK Committee
WG07072020

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Monday, July 6, 2020

[paper] TCAD modeling of neuromorphic systems based on ferroelectric tunnel junctions

Yu He, Wei-Choon Ng and Lee Smith
TCAD modeling of neuromorphic systems based on ferroelectric tunnel junctions
J Comput Electron (2020)
DOI: 10.1007/s10825-020-01544-z

Abstract: A new compact model for HfO2-based ferroelectric tunnel junction (FTJ) memristors is constructed based on detailed physical modeling using calibrated TCAD simulations. A multi-domain configuration of the ferroelectric material is demonstrated to produce quasi-continuous conductance of the FTJ. This behavior is demonstrated to enable a robust spike-timing-dependent plasticity-type learning capability, making FTJs suitable for use as synaptic memristors in a spiking neural network. Using both TCAD–SPICE mixed-mode and pure SPICE compact model approaches, we apply the newly developed model to a crossbar array configuration in a handwritten digit recognition neuromorphic system and demonstrate an 80% successful recognition rate. The applied methodology demonstrates the use of TCAD to help develop and calibrate SPICE models in the study of neuromorphic systems.
Fig: Electric field–polarization relationship. Solid line: multi-domain simulation; dashed line: single-domain simulation; dot: measurement 





[paper] Real-Time Monitoring of Cell Cultures with Nickel Comb Capacitors

Kociubiński, Andrzej, Dawid Zarzeczny, Maciej Szypulski, Aleksandra Wilczyńska, Dominika Pigoń, Teresa Małecka-Massalska, and Monika Prendecka
Real-Time Monitoring of Cell Cultures with Nickel Comb Capacitors
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska 
10, no. 2 (2020): 32-35
DOI: 10.35784/iapgos.1564

Abstract: The  aim  of  the  study  was  to  present  a  method  for  assessing  the condition of  cell  culture  by  measuring  the  impedance  of  cells  cultured  in  the presence of nickel. For this purpose, an impedance measurement technique using nickel comb capacitors was used. The capacitor electrodes were made using a thin film magnetron sputtering. In the experimental part, the culture of cells of mouse fibroblasts on the prepared substrate was performed. The cell culture lasted 43 hours and showed that the presented technique allows it to be used to analyze the effect of nickel on cells.
Fig: The final nickel electrode array with 8 wells

IEEE Events Reveal #Future #Memory And #Storage https://t.co/lfOq1d8BG3 #paper https://t.co/q7p7pc4ZPd


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July 06, 2020 at 11:55AM
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With #128 #Core #Chip, Ampere Seeks to Deliver Reliable Advances [@EETimes] https://t.co/zq3ovp6WPN #paper https://t.co/CLY45rUvGP


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@ETH integrates #photonics and #electronics on one #chip https://t.co/Lg1KYDF0RS #paper https://t.co/5HKJTzOR51


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A Vibrant #Semiconductor #Manufacturing #Model for the #US [Semiwiki] https://t.co/rjT2bSloqX https://t.co/WozbLN0s6h


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Thursday, July 2, 2020

$1#billion market for #SiC and #GaN https://t.co/D0ukYu8BAK #paper https://t.co/BVZjWuNXlr


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[paper] 1T-1C Dynamic Random Access Memory

1T-1C Dynamic Random Access Memory: 
Status, Challenges, and Prospects 
Alessio Spessot and Hyungrock Oh 
(Invited Paper)
IEEE TED, 67(4), 1382–1393
DOI:10.1109/ted.2020.2963911 

Abstract: This article reviews the status, the challenges, and the perspective of 1T-1C dynamic random access memory (DRAM) chip. The basic principles of the DRAM are presented, introducing the key functional aspects and the structure of modern devices. We present the most relevant historical trends for different modules of the memory chip, such as access device and storage element, reviewing some of the technological challenges faced by industry to guarantee the device shrinking imposed by the economic law. The most recent solutions introduced by the industry in modern DRAM devices for the critical elements are presented. Finally, a survey of the most critical bottleneck for future development is presented, reviewing some of the potential trends and perspectives of DRAM development.

Fig: Review of the historical evolution trend for the cell access device. Various cell access device options are shown. The 4F2 is enabled by the vertical channel. Corresponding technology nodes are included. 

Acknowledgment: The authors would like to thank the imec Core Partners Program for the support. They would also like to thank N. Horiguchi, A. Furnemont, M. H. Na, E. Dentoni Litta, R. Ritzenthaler, and M. Popovici from imec, P. Fazan and C. Mouli from Micron, and C. Kim, Y. Son, and Y. Ji from SK Hynix for the interesting discussions.

[paper] Atomistic Level Simulation of GaNFET

R. K. Nanda1, E. Mohapatra1, T. P. Dash1, P. Saxena2, P. Srivastava2, R. Trigutnayat2
and C. K. Maiti1
Atomistic Level Process to Device Simulation of GaNFET Using TNL TCAD Tools
chapter in Lecture Notes in Electrical Engineering book series (LNEE, volume 665)
doi:10.1007/978-981-15-5262-5 

1Department of Electronics and Communication Engineering, Siksha ‘O’ Anusandhan, Bhubaneswar, Odisha 751030, India
2Tech Next Lab (P) Limited, Niwaz Ganj, Lucknow 226003, India

Abstract: An atomistic level process to device simulation tools developed by Tech Next Lab (TNL) is reported. Modeling of the deposition of high-quality ultrathin AlGaN epitaxial films grown on GaN substrates by molecular beam epitaxy (MBE) has been performed. The surface morphology, crystalline quality, and interfacial property of as-grown AlGaN epitaxial films on GaN substrates are studied using simulation. The epitaxial layer characterization for extract of exact carrier mobility and use of epitaxially grown material for GaN-FET device application has been demonstrated. Results obtained on the basis of process to device simulation have been calibrated with reported results.

Fig: Device structure with 25 nm thick AlGaN/GaN layer grown on SiC (100) substrate and its output Id –Vd characteristics






Wednesday, July 1, 2020

Tuesday, June 30, 2020

[paper] Compact Model for SIS Josephson Junctions

A Compact Model for Superconductor-Insulator-Superconductor (SIS) Josephson Junctions
Shamiul Alam, Mohammad Adnan Jahangir and Ahmedullah Aziz, Member, IEEE
Department of Electrical Engineering and Computer Science
University of Tennessee, Knoxville, TN, USA
in IEEE Electron Device Letters, 
DOI: 10.1109/LED.2020.3002448

Abstract: We present a Verilog-A based compact model for the superconductor-insulator-superconductor (SIS) Josephson junction. The model can generate both hysteretic and non-hysteretic current-voltage (I-V) response for the SIS junctions utilizing the Stewart-McCumber damping parameter. We calibrate our model with different SIS samples and demonstrate accurate matching between the simulated and experimental results. We implement temperature effect on the energy gap and the critical current of the superconductor to explore the dynamic trends in device characteristics. We calculate the junction inductance and stored energy as functions of junction current and temperature. We simulate the read/write operations of an SIS junction based cryogenic memory cell to illustrate the usability of our model.
Fig: (a) Device structure of an SIS Josephson junction
(b) the RCSJ model of a Josephson junction.



[paper] 3D Vertical JL GAA Si Nanowire Transistors

Chhandak Mukherjee1, Guilhem Larrieu2 and Cristell Maneuxsup1

Compact Modeling of 3D Vertical Junctionless Gate-all-around Silicon Nanowire Transistors

EuroSOI-ULIS 2020, Sep 2020, Caen (F)

1IMS Laboratory, University of Bordeaux, France

2LAAS-CNRS, Université de Toulouse, France 

HAL: hal.archives-ouvertes.fr/hal-02869216


Abstract: This paper presents a physics based, computationally efficient compact modeling approach for 3D vertical gate-all-around junctionless nanowire transistor (JLNT) arrays designed for future high performance computational logic circuit. The model features an explicit continuous analytical form adapted for a 14 nm channel JLNT technology and has been validated against extensive characterization results on a wide range of JLNT geometry, depicting good accuracy. Finally, preliminary logic circuit simulations have been performed for benchmarking performances of transistor logic circuits, such as inverters and ring oscillators, designed using the developed model.

Fig: The vertical JLNT: (a) SEM image of nanowire arrays, 

(b) single nanowire showing its (c) gate formation 


Acknowledgement: This work is supported by ANR under Grant ANR-18- CE24-0005-01

[webinar] Differentiated FDSOI for mmWave Solutions

WEBEX by IEEE EDS Santa Clara Valley/San Francisco Chapter

Differentiated Fully Depleted SOI (FDSOI) Technology 
for Highly Efficient and Integrated mmWave Wireless Connectivity Solution
Speaker: Dr. Anirban Bandyopadhyay,  Director, Strategic Marketing and Business Analytics, GLOBALFOUNDRIES, Inc., Santa Clara, CA
Friday, July 24, 2020 at 12PM – 1PM PDT

Abstract: The emergence of enhanced mobile broadband (eMBB) connectivity based on mmWave 5G and the emerging prospect of broadband internet to using non-terrestrial mmwave backhaul using low earth orbit (LEO) satellite generated huge interest in the entire telecommunication ecosystem. While mmwave allows huge bandwidth of channels to enable enhanced broadband, it also poses a lot of technical challenges in terms of coverage, generating enough transmitted power efficiently particularly in the uplink, system cost & scaling and long term reliability of the hardware system particularly for infrastructure including Satellite born systems. Current talk will focus on how Silicon technologies based on differentiated fully depleted SOI (FDSOI) can address the above challenges by enabling a highly efficient and integrated radio without compromising on the mmWave performance and reliability. Talk will highlight the technology Figures of Merits (FOMs) for a mmwave phased array system and how a differentiated FDSOI technology platform compares with other silicon technologies in terms of devices and circuits.

Speaker Bio: Dr. Anirban Bandyopadhyay is the Director, Strategic Marketing and Business Analytics within the Mobility & Wireless Infrastructure Business Unit of GLOBALFOUNDRIES, USA. His work is currently focused on hardware architecture & technology evaluations for emerging RF and mmWave applications. Prior to joining GLOBALFOUNDRIES, he was with IBM Microelectronics, New York and with Intel, California where he worked on different areas like RF Design Enablement, Silicon Photonics, signal integrity in RF & Mixed signal SOC’s. Dr. Bandyopadhyay did his PhD in Electrical Engineering from Tata Institute of Fundamental Research, India and Post-Doctoral research at Nortel, Canada and at Oregon State University, USA. He represents Global Foundries in different industry consortia on RF/mmWave applications and is a Distinguished Lecturer of IEEE Electron Devices Society.

More information at the IEEE EDS Santa Clara Valley-San Francisco Chapter Home Page

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Monday, June 29, 2020

IEEE SSCS-EDS Distinguished Talks (Webinar) Systematic Design of Analog CMOS Circuits Dr. Paul Jespers, UCLouvain, Louvain-la-Neuve, Belgium July 09th, 13h30 (Brasilia Time, GMT-3) https://t.co/d3HL96l2xT https://t.co/FQOFMq4FJG #paper https://t.co/zelqSxMxGI


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Friday, June 26, 2020

Creating A Custom ASIC With The First Open Source PDK: The FOSSi foundation now reports on a new, open PDK project launched by Google and SkyWater Technology https://t.co/6G78tYz4c1 #model https://t.co/NOCZS6YMr5


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Thursday, June 25, 2020

Neurotransistor MatLab Code

Eunhye Baek, Nikhil Ranjan Das, Carlo Vittorio Cannistraci, Taiuk Rim, Gilbert Santiago Cañón Bermúdez, Khrystyna Nych, Hyeonsu Cho, Kihyun Kim, Chang-Ki Baek, Denys Makarov, Ronald Tetzlaff, Leon Chua, Larysa Baraban and Gianaurelio Cuniberti
Intrinsic plasticity of silicon nanowire neurotransistors for dynamic memory and learning functions
Nat Electron (2020). 
DOI: 10.1038/s41928-020-0412-1

Abstract: Neuromorphic architectures merge learning and memory functions within a single unit cell and in a neuron-like fashion. Research in the field has been mainly focused on the plasticity of artificial synapses. However, the intrinsic plasticity of the neuronal membrane is also important in the implementation of neuromorphic information processing. Here we report a neurotransistor made from a silicon nanowire transistor coated by an ion-doped sol–gel silicate film that can emulate the intrinsic plasticity of the neuronal membrane. The neurotransistors are manufactured using a conventional complementary metal–oxide–semiconductor process on an 8-inch (200 mm) silicon-on-insulator wafer. Mobile ions allow the film to act as a pseudo-gate that generates memory and allows the neurotransistor to display plasticity. We show that multiple pulsed input signals of the neurotransistor are non-linearly processed by sigmoidal transformation into the output current, which resembles the functioning of a neuronal membrane. The output response is governed by the input signal history, which is stored as ionic states within the silicate film, and thereby provides the neurotransistor with learning capabilities.

FIG: Illustration of the structural similarity between the ion migration in the neurotransistor (left) and the membrane of a neuron cell in which the ionic current was modulated by a membrane potential (Vmemb) change in the case of the action potential (right)

Code availability: The MatLab code that supports the mathematical model in this article is available
at https://github.com/eunhye8747/MatLab-Code-Neurotransistor

Acknowledgements: This research was supported by the German Excellence Initiative via the Cluster of Excellence EXC1056 Center for Advancing Electronics Dresden (CfAED) and the MSIP (Ministry of Science, ICT and Future Planning), Korea, under the ICT Consilience Creative Program (IITP-R0346-16-1007) supervised by the IITP (Institute for Information & communications Technology Promotion). We acknowledge support from the Initiative and Networking Fund of the Helmholtz Association of German Research Centers through the International Helmholtz Research School for Nanoelectronic Networks (IHRS NANONET) (no. VH‐KO‐606) and German Research Foundation (DFG) via grants MA 5144/9-1, MA 5144/13-1 and MA 5144/14-1; BA4986/7−1, BA4986/8−1. Finally, we thank the INSA-DFG Bilateral Exchange Programme for financial support (IA/ DFG/2018/138, 12 April 2018). The authors thank S. Oswald (IFW Dresden) for the X-ray photoemission spectroscopy analysis of the ion-doped hybrid silicate films and M. Park (NamLab, Dresden) for the insightful discussion about the ionic polarization in the film. We thank R. Nigmetzianov (TU Dresden) for the film analysis.

[paper] Ge Twin-Transistor NVM with FinFET Structure

Siao-Cheng Yan, Chong-Jhe Sun, Meng-Ju Tsai (Student Member, Ieee), Lun-Chun Chen,
Mu-Shih Yeh (Member, IEEE), Chien-Chang Li, Yao-Jen Lee and Yung-Chun Wu (Member, IEEE)
Germanium Twin-Transistor Nonvolatile Memory with FinFET Structure
IEEE J-EDS vol. 8, pp. 589-593, 2020
DOI: 10.1109/JEDS.2020.2999616

Abstract: Germanium is a promising alternative material for use in advanced technology nodes because it exhibits symmetrical mobility of holes and electrons. Embedded nonvolatile memory (NVM) is essential in electronic devices with integrated circuit (IC) technology, including future Ge-based technology. In this paper, we demonstrate Ge twin-transistor NVM with a fin field-effect transistor (FinFET) structure. This Ge twin-transistor NVM exhibits high programming and erasing speeds and satisfactory reliability. Moreover, the masks and fabrication process of this Ge twin-transistor NVM are identical to those of Ge-channel FinFETs. Thus, Ge twin-transistor NVM is a promising candidate for embedded NVM applications in future high-performance Ge complementary metal–oxide–semiconductor technology (CMOS).
FIG:  (a) Schematic top view of the Ge Twin NVM with one fin,
and (b) process flow of the Ge Twin NVM

Acknowledgements: This work was supported in part by Ministry of Science and Technology, Taiwan, under contract MOST 108-2221-E-007-003, and in part by Taiwan Semiconductor Research Institute, Taiwan.


[paper] Statistical modelling of oTFT

Faris, T. M. and Winscom, C. J. 
Statistical modelling of organic thin film transistor behaviour
Organic Electronics (2020, 105846
DOI:10.1016/j.orgel.2020.105846 

Abstract: Three analyses of the expressions describing the electrical characteristics of organic thin film transistors (OTFT's) are presented. The first is the field-independent approach to mobility originally used for inorganic semiconductor materials, often referred to as the Square Law (SQL). The second is appropriate for both the Multiple Trapping and Release (MTR) and the Variable Range Hopping (VRH) descriptions of mobility, where dependence on a transverse field is consistent with the Universal Mobility Law (UML). The third is appropriate for the Extended Gaussian Disorder (EGD) description where an exponential dependence of mobility on the transverse field occurs. In each case master equations have been derived, including Schottky contact effects, where the polarity of the voltage drop across the source and drain contacts is correctly taken into account for the first time. The effect of the bulk semiconductor material beyond the accumulation layer is also accounted for, and defines the sub-threshold performance in a low-voltage regime. A new statistical modelling procedure has been developed to extract the key parameters of these expressions simultaneously from experimental data. For the analysis of TRANSFER data, no more than five parameters are used in the SQL, UML and EGD treatments. All three models are considered so that the effect the choice of model has on the extracted parameters can be revealed; analysis of data from different metallophthalocyanines is used to illustrate the different effects. When the contact resistances correctly take into account possible Schottky-like behaviour, all three descriptions provide equally excellent fits to the data from TRANSFER experiments.  In a following report, a family of copper phthalocyanine-related semi-conductors will be examined in detail using these new analysis procedures to explore the effect of non-peripheral substituent bulk, and aza-nitrogen replacement by CH, on mobility.
Fig: Comparison of Ohmic-only vs. Ohmic+Schottky contact resistance extractions for
the linear region of GdPc2 TRANSFER data for VD=-5V

Acknowledgements: A. K. Ray (Brunel University, Uxbridge) and A. K. Sharma (USAF Research Laboratory) are gratefully acknowledged for providing some resources and experimental data. DZP Technologies Ltd., UK and USAF Research Laboratory, Space Vehicles Directorate, USA are thanked for sponsoring the project, and providing support to TMF.

Wednesday, June 24, 2020

[paper] Hot Carrier Degradation in n-MOSFETs

S. Mahapatra and U. Sharma, 
Department of Electrical Engineering,
IIT Bombay, Mumbai 400076, India
A Review of Hot Carrier Degradation in n-Channel MOSFETs
Part I: Physical Mechanism
IEEE TED, vol. 67, no. 7, pp. 2660-2671, July 2020
DOI: 10.1109/TED.2020.2994302

Abstract: Transistor parametric drift due to conduction mode hot carrier degradation (HCD) in n-MOSFETs is reviewed, for long- and short-channel length (LCH) devices having different source/drain (S/D) junction structures. The HCD magnitude and time kinetics shape are discussed for stress under different gate (VG) and drain (VD) biases with varying VG/VD ratio, and without and with substrate bias (VB). Post-dc stress kinetics is discussed. The published data are qualitatively analyzed to identify the roles of different underlying physical mechanisms. In part II of this article, impacts of technology scaling and stress temperature (T) and comparison of dc and ac stress are discussed.
Fig: (a) Schematic of an LDD MOSFET. Carrier heating process, primary and secondary impact ionization, respectively, at VB=0V and VB < 0V, and gate injection are shown. Charges due to HCD in the channel (square), gate–drain overlap (triangle), and spacer (diamond) regions are shown. (b) Energy band diagram showing the energy thresholds for impact ionization, and electron and hole injection over their respective channel-oxide barriers. AHI process is illustrated at (VG–VD) > 0V.


EEE SSCS-EDS Distinguished Talks (Webinar) Low-power Circuits for IoT Dr. Jorge Fernandes, INESC-ID, Lisbon, Portugal. Next Thursday, June 25th, 2:00 PM (Brasilia Time, GMT-3) https://t.co/wJuF6ryZHW #paper https://t.co/6jrZWrKTAh


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[paper] AlGaN/AlN/GaN/AlGaN photodetector

Khaouani, M., Hamdoune, A., Bencherif, H., Kourdi, Z. and Dehimi, L. 
An ultra-sensitive AlGaN/AlN/GaN/AlGaN photodetector:
Proposal and investigation
Optik (2020). , 217, 164797
DOI:10.1016/j.ijleo.2020.164797 

Abstract: In this paper, an AlGaN/AlN/GaN/AlGaN photodetector high electron mobility transistor is designed and simulated. The proposed structure incorporates an AlN spacer layer between the AlGaN and GaN layers to ensure good control of the two-dimensional gas, which improve, in turn, the device controllability. Besides, an overall figures of merit assessment is performed to highlights the design benefits. The suggested device provides a very high responsivity of 0.2641 A/W, a photocurrent of 1.1 × 10−7 A, a suitable (Iilumination/Idark) rejection of 10.8, and a high efficiency η of about 77%. The photo and dark current is at 2 V, 87 mA and 8 mA, respectively. A subthreshold slope (SS) of 53 mV/V and 42 mV/V, and a transconductance gm of 260 ms/mm and 180 ms/mm are obtained. The proposed photodetector springly outperforms the HEMT PD designs previously proposed in the literature.
Fig: 2D-structure of AlGaN/AlN/GaN/AlGaN Photodetector HEMT

Acknowledgements: This work was supported by DGRSDT of Ministry of Higher education of Algeria. The work was done in the unit of research of materials and renewable energies (URMER).

[paper] Compact Modeling of Parasitic FET capacitance

Sharma, S. M., Singh, A., Dasgupta, S., & Kartikeyan, M. V. 
A review on the compact modeling of parasitic capacitance: 
from basic to advanced FETs. 
Journal of Computational Electronics
DOI: 10.1007/s10825-020-01515-4

Abstract: This paper presents a review on the development of parasitic-capacitance modeling for metal–oxide–semiconductor feldefect transistors (MOSFETs), covering models developed for the simple parallel-plate capacitance and the nonplanar and coplanar plate capacitances required for the intrinsic and extrinsic part of such devices. A comparative study of various extrinsic capacitance models with respect to a reference model is used to analyze the benefts of the various approaches. Capacitance models for basic MOSFETs and advance multigate FETs with two-dimensional (2D) and three-dimensional (3D) structures are reviewed. It is found that the elliptical feld lines between the gate electrodes and source/drain region are modeled very well, while deviations of ±2% in the orthogonal plate capacitance are observed when the gate electrode thickness is varied from 5 to 20nm.
Fig: The 3D structure of a FinFET

Acknowledgements: The authors would like to thank the Department of Electronics and Communication Engineering, IIT Roorkee, for their valuable support in carrying out this research work.



[paper] SPICE Model for Bipolar Resistive Switching Devices

Miranda, Enrique, and Jordi Suñé
Departament d’Enginyeria Electrònica,
UAB, 08193 Barcelona, Spain
Fundamentals and SPICE Implementation of the Dynamic Memdiode Model
for Bipolar Resistive Switching Devices
(2020 - techrxiv.org)

Abstract: This paper reports the fundamentals and SPICE  implementation of the dynamic memdiode model (DMM) for the  conduction characteristics of bipolar resistive switching (RS)  devices. Following Chua’s memristive devices theory, the  memdiode model comprises two equations, one for the electron  transport based on a heuristic extension of the quantum pointcontact model for filamentary conduction in dielectrics and a  second equation for the internal memory effect related to the  reversible displacement of atomic species within the oxide film.  The DMM represents a breakthrough with respect to the previous  quasi-static memdiode model (QMM) since it describes the  memory state of the device as a rate balance equation  incorporating both the snapback and snapforward effects,  features of utmost importance for the accurate and realistic  simulation of the RS phenomenon. The DMM allows simple setting  of the memory state initial condition as well as separate modeling  of the set and reset transitions. The model equations are  implemented in the LTSpice simulator using an equivalent  circuital approach with behavioral components and sources. The  practical details of the model implementation and its use are  thoroughly discussed.   
Fig: Hysteretic behavior of the filamentary-type I-V characteristic.
Filament stages: A) formation, high resistance state (HRS), B) completion, C) expansion,
D,F) complete expansion, low resistance state (LRS), G) dissolution, I) rupture.

Supplementary information: The memdiode model script for LTSpice XVII reported in this Appendix includes not only the DMM but also the QMM. It is important to activate one of the options at a time (DMM or QMM) by inserting asterisks (*) in the corresponding lines. The parameter list, I-V, and Auxiliary functions sections are common to both approaches. This does not mean that the obtained curves will be identical. The meaning of the parameters is discussed in the text and in previous papers.

LTSPICE script
.subckt memdiode + - H
*created by E.Miranda & J.Suñé, June 2020
.params
+ H0=0 ri=50
+ etas=50 vs=1.4
+ etar=100 vr=-0.4
+ imax=1E-2 amax=2 rsmax=10
+ imin=1E-7 amin=2 rsmin=10
+ vt=0.4 isb=200E-6 gam=1 gam0=0 ;isb=1/gam=0 no SB/SF
+ CH0=1E-3 RPP=1E10 I00=1E-10
*Dynamic model
BV A 0 V=if(V(+,-)>=0,1,0)
RH H A R=if(V(+,-)>=0,TS(V(C,-)),TR(V(C,-)))
CH H 0 1 ic={H0}
*Quasi-static model
*BH 0 H I=min(R(V(C,-)),max(S(V(C,-)),V(H))) Rpar=1
*CH H 0 {CH0} ic={H0}
*I-V
RE + C {ri}
RS C B R=RS(V(H))
BD B - I=I0(V(H))*sinh(A(V(H))*V(B,-))+I00
RB + - {RPP}
*Auxiliary functions
.func I0(x)=imin+(imax-imin)*limit(0,1,x)
.func A(x)=amin+(amax-amin)*limit(0,1,x)
.func RS(x)=rsmin+(rsmax-rsmin)*limit(0,1,x)
.func VSB(x)=if(x>isb,vt,vs)
.func ISF(x)=if(gam==0,1,pow(limit(0,1,x),gam)-gam0)
.func TS(x)=exp(-etas*(x-VSB(I(BD))))
.func TR(x)= exp(etar*ISF(V(H))*(x-vr))
.func S(x)=1/(1+exp(-etas*(x-VSB(I(BD)))))
.func R(x)=1/(1+exp(-etar*ISF(V(H))*(x-vr)))
.ends

Acknowledgements: This work was funded by the WAKeMeUP 783176 project, co‐ funded by grants from the Spanish Ministerio de Ciencia, Innovación y Universidades (PCI2018‐093107 grant) and the ECSEL EU Joint Undertaking and by project TEC2017-84321- C4-4-R funded by the Spanish Ministerio de Ciencia, Innovación y Universidades. Dr. G. Patterson and Dr. A. Rodriguez are greatly acknowledged for their contributions to the development of the ideas reported in this work


Tuesday, June 23, 2020

Webinar Series by Distinguished Experts

 
 The National Academy of Sciences, India (NASI)
- Delhi Chapter-
and
 
 MHRD-Institution Innovation Council (IIC)
Deen Dayal Upadhyaya College Chapter
(University of Delhi)
Under the aegis of DBT Star College Program
 
Jointly Organizes
Webinar Series by Distinguished Experts
 June 25, 2020 @ 10 am Indian Standard Time
Printed and Flexible Electronics and Devices
Dr. Jin-Woo Han
Research Scientist, Center for Nanotechnology,
NASA Ames Research Center, Moffett Field, California, USA
 
July 03, 2020 @ 04:30 pm Indian Standard Time
New chemistry and physics in magnetic oxides
Prof. J. Paul Attfield, FRS FRSE FRSC, Foreign Fellow INSA
Professor of Materials Science at Extreme Conditions
School of Chemistry, Centre for Science at Extreme Conditions,
The University of Edinburgh, Edinburgh
 July 09, 2020 @ 06:30 pm Indian Standard Time
Prof. Katepalli Sreenivasan, Foreign Fellow INSA
Dean Emeritus of NYU Tandon School of Engineering;
The Eugene Kleiner Professor for Innovation in Mechanical Engineering;
Professor of Physics (Faculty of Arts and Science);
Mathematics (Courant Institute of Mathematical Sciences)
 

July 10, 2020 @ 01:30 India Standard Time
Can Future Energy Needs be met Sustainably?
Prof. Sir Chris Llewellyn Smith, FRS, FAPS (USA), Honorary Fellow, IOP (UK), Foreign Fellow INSA(India)
Rudolf Peierls Centre for Theoretical Physics
Parks Road, Oxford OX1 3PU
 July 11, 2020 @ 03:30 pm Indian Standard Time
Are we there yet? How do cells find their way?
Prof. Philip K. Maini, FRS, FIMA, FRSB, FMedSci, Foreign Fellow INSA (India)
Wolfson Centre for Mathematical Biology
Mathematical Institute, Andrew Wiles Building, Radcliffe Observatory Quarter
Woodstock Road, Oxford
 July 14, 2020 @ 04:30 pm Indian Standard Time
The influence of infection on Society before Covid19
Prof. Sir Peter Julius Lachmann, FRS, FRCP, FRCPath, FMedSci, Foreign Fellow INSA(India)
Fellow, Emeritus Sheila Joan Smith Professor of Immunology
Christ College, University of Cambridge
No registration fee to attend the Lecture. However, all interested should register via Google form on or before June 22, 2020 to attend the lectures via CISCO Webex/Google Meet. Link for Google form:

Organizer: Prof. Ajoy Ghatak, Chairperson - NASI Delhi Chapter & Prof. Anurag Sharma, Secretary - NASI Delhi Chapter
Coordinator:
Dr. Manoj Saxena, MNASc and Executive Committee Member-NASI Delhi Chapter
Associate Professor, Deptt. of Electronics, Deen Dayal Upadhyaya College, University of Delhi, New Delhi
Dr. Geetika Jain Saxena, Associate Professor, Department of Electronics, Maharaja Agrasen College, University of Delhi, New Delhi

Stay up to date with the latest developments in the MEMS areas with IEEE RightNow. Access for J-MEMS. Enjoy temporary Open Access to selected featured publications https://t.co/mxoRhbT802 #paper https://t.co/9h5EV2mEBf


from Twitter https://twitter.com/wladek60

June 23, 2020 at 11:56AM
via IFTTT

Monday, June 22, 2020

[paper] “Extrinsic” Compact Model of the MOSFET Drain Current

V. O. Turin, R. S. Shkarlat, G. I. Zebrev, B. Iñiguez and M. S. Shur
The “Extrinsic” Compact Model of the MOSFET Drain Current Based on a New Interpolation Expression for the Transition Between Linear and Saturation Regimes with a Monotonic Decrease of the Differential Conductance to a Nonzero Value
2020 4th IEEE EDTM, Penang, Malaysia
2020, pp. 1-4
doi: 10.1109/EDTM47692.2020.9117810

Abstract: Previously, we proposed a new interpolation expression to bridge the transition between the linear and the saturation regimes of “intrinsic” MOSFET. This approach, in contrast to the traditional one, gives a monotonic decrease of the differential conductance from the maximum value in the linear regime to the minimum value in the saturation regime. Later, we proposed a linear approximation for an “extrinsic” MOSFET drain current dependence on the “extrinsic” drain bias in the saturation regime for not very high drain bias when nonlinear effects can be neglected. To obtain this approximation, an equation for the output differential resistance of the “extrinsic” MOSFET in saturation regime was obtained, that is similar to the result known from the theory of the common source MOSFET amplifier with source degeneration. In this paper, we combine these two results and present an “extrinsic” compact model for a short-channel MOSFET above threshold drain current with proper account of the differential conductance in the saturation regime.



[paper] Analog/RF Tri-metal Gate FinFET

N. G. P, S. Routray and K. P. Pradhan
Assessment of Analog/RF performances for 10 nm Tri-metal Gate FinFET
2020 4th IEEE EDTM; 2020, pp. 1-4
Penang, Malaysia
DOI: 10.1109/EDTM47692.2020.9117846

Abstract: Reduction in parasitic capacitance and resistance in FinFET is quite necessary in order to achieve high performance. In this paper, an intensive study on structural advancement in three different ways is implemented in basic FinFET structure such as (a) addition of thin silicide layer as interfacial layer between the contact and source/drain (b) extended and elevated source/drain (c) addition of hybrid spacer. Additionally, comparative study on the analog and RF performance is performed and analyzed for this structure between single material gate (SMG) and tri material gate (TMG) FinFET with all above enhancements. The analog parameters that have been analyzed are transconductance (gm), transconductance generation factor (TGF), output conductance (gd), and intrinsic gain (gm/gd). Similarly, the RF parameters like gate capacitance (CGG), cut-off frequency (fT), transconductance frequency product (TFP), gain frequency product (GFP), and gain transconductance frequency product (GTFP) are reported. Even though there is a degradation in the mobility for the TMG FinFET, but on a whole provides better performance. Furthermore, the effect of temperature on the drain current and transconductance has been shown for the TMG structure by varying the temperature from 200 to 350K with intervals of 50K which would be the extension to this paper. Analysis gives a potential overview on different structural improvement in order to achieve higher performance.
Fig. I. Top view of the proposed FinFET structure

Fig. II. (a) Gate capacitance (b) cutoff frequency (c) intrinsic delay (d) TFP (e) GFP (f) GTFP plots by variation of gate material.


[virtual] ToM2020/2 Announcement

ToM2020/2 Course
September, 8th, 2020
    14.00-17.30    Danilo Gerna (Melexis Technologies), “Advanced Hall Element Based Magnetic Sensors Front End Design”

September, 9th, 2020
    9.00-12.30    Carlo Samori (Milan Politechnic), “PLL: From Analog to Digital and Recent Trends”
    14.00-17.30    Alex Tranca (Infineon), “Robust Design of Smart Power ICs for Automotive Applications, with Focus on Load Current Sensing”

September, 10th, 2020
    9.00-12.30    Alfio Dario Grasso (Univ. Catania), “Ultra-Low Power Amplifiers for IoT Nodes”
    14.00-17.30    Gabriella Ghidini (STMicroelectronics), “Dielectric Reliability in Microelectronics”

In this particular situation, the PhD School at University of Milan-Bicocca decided to fully support the costs of the ToM2020/2 course, whose participation will then be free-of-charge for the attendees. However, for proper managing internet access to the virtual ToM2020/2 course, registration is mandatory at the following website:
http://www.innotechevents.com/index.php?page=ToM/RegistrationForm.html

Only registered participants will receive access information for the course.
At the end of the course, an exam will be proposed for certifying the positive attendance (please register to the exam with the course registration).
We look forward to virtually meeting you !!!!

More information at:
http://www.innotechevents.com/index.php?page=ToM/ToM.html

[virtual] IEEE EDS DL Mini-Colloquium at MIXDES Wroclaw


EDS Distinguished Lecturer Mini-Colloquium 
"Semiconductor-based sensors - technology, modeling, applications" 
(virtual at MIXDES), June 27, 2020
Chairs: Wladek Grabinski, Daniel Tomaszewski

10.00-10.45
Arokia Nathan "Ultralow Power, High-Resolution Sensor Interfaces"
EDS Distinguished Lecturer, Cambridge Touch Technologies, UK; E-mail: an299@cam.ac.uk
10.45-11.30
Mike Schwarz "Sensor Design – From Prototype to Series"
Robert Bosch GmbH, 72703 Reutlingen,Germany; E-mail: Mike.Schwarz@de.bosch.com
12.00-12.45
Benjamin Iñíguez "Compact Modeling and Parameter Extraction for Oxide and Organic Thin Film Transistors (TFTs) from 150K to 350K"
EDS Distinguished Lecturer, Department of Electrical, Electronics Engineering and Automatic Control Engineering, Universitat Rovira i Virgili, 43007 Tarragona, Spain; E-mail: benjamin.iniguez@urv.cat
12.45-13.30
Teoder Gotszalk " Microsystem Electronics and Photonics "
Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Poland; E-mail: teodor.gotszalk@pwr.edu.pl
13.30-14.15
Mina Rais-Zadeh "Phase change electro-optical devices for space applications" (recorded)
EDS Distinguished Lecturer, NASA Jet Propulsion Lab., California Institute of Techn., USA; E-mail: minar@umich.edu