Serge Ecoffey

ORCID: 0000-0002-3002-501X
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About
Contact & Profiles
Research Areas
  • Semiconductor materials and devices
  • Advanced Memory and Neural Computing
  • Advancements in Semiconductor Devices and Circuit Design
  • Ferroelectric and Negative Capacitance Devices
  • Advanced Surface Polishing Techniques
  • Nanowire Synthesis and Applications
  • Nanofabrication and Lithography Techniques
  • Quantum and electron transport phenomena
  • 3D IC and TSV technologies
  • Analytical Chemistry and Sensors
  • Copper Interconnects and Reliability
  • Integrated Circuits and Semiconductor Failure Analysis
  • Optical Coatings and Gratings
  • Neuroscience and Neural Engineering
  • Advancements in Photolithography Techniques
  • Thin-Film Transistor Technologies
  • CCD and CMOS Imaging Sensors
  • Electronic and Structural Properties of Oxides
  • Electronic Packaging and Soldering Technologies
  • Quantum-Dot Cellular Automata
  • Silicon Nanostructures and Photoluminescence
  • Gas Sensing Nanomaterials and Sensors
  • Semiconductor materials and interfaces
  • Transition Metal Oxide Nanomaterials
  • Metal and Thin Film Mechanics

Université de Sherbrooke
2015-2024

Laboratoire Nanotechnologies et Nanosystèmes
2020-2024

Centre de Nanosciences et de Nanotechnologies
2016-2023

IBM (Canada)
2023

Institut National des Sciences Appliquées de Lyon
2013

Centre National de la Recherche Scientifique
2013

Université Joseph Fourier
2013

École Polytechnique Fédérale de Lausanne
2001-2006

The low communication bandwidth between memory and processing units in conventional von Neumann machines does not support the requirements of emerging applications that rely extensively on large sets data. More recent computing paradigms, such as high parallelization near‐memory computing, help alleviate data bottleneck to some extent, but paradigm‐shifting concepts are required. In‐memory has emerged a prime candidate eliminate this by colocating processing. In context, resistive switching...

10.1002/aisy.202000115 article EN cc-by Advanced Intelligent Systems 2020-08-23

Brain-inspired computing and neuromorphic hardware are promising approaches that offer great potential to overcome limitations faced by current paradigms based on traditional von-Neumann architecture. In this regard, interest in developing memristor crossbar arrays has increased due their ability natively perform in-memory fundamental synaptic operations required for neural network implementation. For optimal efficiency, crossbar-based circuits need be compatible with fabrication processes...

10.1016/j.mee.2021.111706 article EN cc-by Microelectronic Engineering 2022-01-03

In recent years, resistive memories have emerged as a pivotal advancement in the realm of electronics, offering numerous advantages terms energy efficiency, scalability, and non-volatility [1]. Characterized by their unique switching behavior, these are well-suited for variety applications, ranging from high-density data storage to neuromorphic computing [2]. Their potential is further enhanced compatibility with advanced semiconductor processes, enabling seamless integration into modern...

10.1016/j.mne.2024.100251 article EN cc-by-nc Micro and Nano Engineering 2024-04-12

Exploration of memristors' behavior at cryogenic temperatures has become crucial due to the growing interest in quantum computing and electronics. In this context, our study focuses on characterization (4.2 K) TiO2−x-based memristors fabricated with a CMOS-compatible etch-back process. We demonstrate so-called reforming (CR) technique performed 4.2 K overcome well-known metal-insulator transition (MIT), which limits analog low temperatures. This process was found be reproducible led durable...

10.1063/5.0170058 article EN cc-by Applied Physics Letters 2023-10-16

The development of metallic single-electron transistor (SET) depends on the downscaling and electrical properties its tunnel junctions (TJs). These TJs should insure high-ON current, low-OFF low capacitance. We propose an engineered TJ based multidielectric stacking. A number high-k low-k materials were considered to optimize TJ's characteristics. optimized is proven increase ION current I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ON</sub>...

10.1109/ted.2015.2452575 article EN IEEE Transactions on Electron Devices 2015-08-13

Current quantum systems based on spin qubits are controlled by classical electronics located outside the cryostat. This approach creates a major wiring bottleneck, which is one of main roadblocks toward scalable computers. Thus, we propose memristor-based programmable dc source that can perform biasing dots (QDs) inside novel cryogenic would enable to control applied voltage electrostatic gates programming resistance memristors, thus storing in latter appropriate conditions form QDs. In this...

10.1109/ted.2023.3244133 article EN cc-by IEEE Transactions on Electron Devices 2023-02-20

We have proposed and validated a true hybrid SET/CMOS device, called SETMOS, that is able to extend the Coulomb blockade oscillations of SET transistor into /spl mu/A current range, corresponding near sub-threshold operation region nanometer-scale MOSFET. New nano-scale analog applications, working at sub-ambient temperatures (-150/spl deg/C up 100/spl deg/C), including novel NDR circuit, amplifiers, even NEMS-SETMOS circuit cells are uniquely supported by SETMOS.

10.1109/iedm.2003.1269377 article EN 2004-03-22

The development of metallic single electron transistor (SET) depends on the downscaling and electrical properties its tunnel junctions. These junctions should insure high current levels, low thermionic current, capacitance. authors use atomic layer deposition to fabricate Al2O3 HfO2 thin layers. Tunnel barrier engineering allows achievement capacitance using optimized annealing plasma exposure conditions. Different stacks were designed fabricated increase transparency junction while...

10.1116/1.4853075 article EN Journal of Vacuum Science & Technology A Vacuum Surfaces and Films 2013-12-30

This paper presents a damascene process for the fabrication of titanium micro/nanostructures and nanowires with adjustable thickness down to 2 nm. Their depth is precisely controlled by chemical-mechanical planarization together in-process electrical characterization. The latter, in combination model resistivity versus thickness, allows control metal line nanometer range. In summary, we have developed end point detection method nanostructures. addition, adopted covers geometrical influences...

10.1088/0957-4484/24/24/245305 article EN Nanotechnology 2013-05-21

Cryogenic memristor-based DC sources offer a promising avenue for in situ biasing of quantum dot arrays. In this study, we present experimental results and discuss the scaling potential such sources. We first demonstrate operation commercial discrete operational amplifier down to 1.2K which is used on source prototype. Then, tunability validated by performing several 250mV-DC sweeps with resolution 10mV at room temperature 1.2K. Additionally, prototype exhibits limited output drift...

10.48550/arxiv.2404.10694 preprint EN arXiv (Cornell University) 2024-04-16

Cryogenic memristor-based DC sources offer a promising avenue for in situ biasing of quantum dot arrays. In this study, we present experimental results and discuss the scaling potential such sources. We first demonstrate operation commercial discrete operational amplifier down to which is used on source prototype. Then, tunability validated by performing several -DC sweeps with resolution at room temperature . Additionally, prototype exhibits limited output drift This showcases biasing....

10.1016/j.cryogenics.2024.103910 article EN cc-by-nc Cryogenics 2024-07-29

An adaptive inference method for crossbar (AIDX) is presented based on an optimization scheme adjusting the duration and amplitude of input voltage pulses. AIDX minimizes long-term effects memristance drift artificial neural network accuracy. The sub-threshold behavior memristor has been modeled verified by comparing with fabricated device data. proposed evaluated testing different structures applications, e.g., image reconstruction classification tasks. results showed average 60%...

10.1109/tcsii.2020.3026642 article EN IEEE Transactions on Circuits & Systems II Express Briefs 2020-09-24

This paper presents the fabrication, together with morphological and electrical characterizations of complementary resistive switches using nanodamascene process. The as-fabricated devices are fully embedded in an insulating oxide, opening way for further process steps such as three-dimensional monolithic integration. Complementary performance is consistent random access memories fabricated characterized same procedure that showed R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

10.1109/tnano.2017.2698205 article EN IEEE Transactions on Nanotechnology 2017-04-26

III-V solar cell cost reduction and direct III-V/Si integration can both be realized by depositing a thin layer of high-quality Ge on relatively low-cost Si substrates. However, epitaxial growth substrates is difficult due to the 4% lattice mismatch between film substrate. Threading dislocations (TDs) introduced within have detrimental effect device performances. The goal this research address perennial need minimize defect density epilayers grown We seek accommodate effects introducing...

10.1117/12.2511080 preprint EN 2019-02-27

With this work we have assessed the minimum thickness and grain size realizable for a polysilicon (poly-Si) layer deposited with low-pressure chemical vapour deposition technique. Three different approaches using pure silane in standard horizontal reactor been evaluated: (i) direct poly-Si deposition, (ii) hemispherical silicon (iii) an amorphous (a-Si) followed by crystallization thermal annealing. It has demonstrated that a-Si/crystallization process seems to be best candidate of...

10.1088/0957-4484/13/3/310 article EN Nanotechnology 2002-05-24

Non-volatile resistive switching devices are considered as prime candidates for next-generation memory applications operating at room temperature and above, such random-access memories or brain-inspired in-memory computing. However, their operability in cryogenic conditions remains to be mastered adopt these building blocks enabling large-scale quantum technologies via quantum-classical electronics co-integration. This study demonstrates multilevel 1.5 K of Al2O3/TiO2-x fabricated with...

10.1088/1361-6528/aba6b4 article EN Nanotechnology 2020-07-16

This paper presents a comparative study of one-bit-full-adder cell based on metallic complementary capacitively coupled single-electron transistors with its 22 nm CMOS counterpart. Performance and energy efficiency are investigated. The CMOS-like transistor full adder is used in two operating mode, hysteresis non-hysteresis. Parallel serial single electron designs introduced. inverter consumes less than 90.4 pW while it dissipates 4.21 nW technology.

10.1109/ulis.2012.6193361 article EN 2012-03-01

A novel analytical and compact model of Single Electron Transistor (SET) is developed implemented in Verilog-A language for use hybrid SET-CMOS logic circuit design. The based on the steady state Master-Equation (ME). implementation this original simple model, taking into account physical characteristics tunnel junctions thermionic emission, has faithfully reproduced behavior metallic SET operating at room temperature. universal gate cell analyzed to illustrate efficiency model.

10.1109/newcas.2011.5981330 article EN 2011-06-01

This paper reports ultrahigh-sensitive and ultralow-power CMOS compatible pH sensors that are developed in the back-end-of-line (BEOL) of industrial 28-nm ultrathin body buried oxide (UTBB) fully depleted silicon-on-insulator (FDSOI) transistors. Fabricating sensing gate control a capacitive divider circuit, demonstrated where front bias is applied through rather than bulky reference electrode. On other hand, strong electrostatic coupling between back FDSOI devices provide an intrinsic...

10.1109/jeds.2018.2861622 article EN cc-by-nc-nd IEEE Journal of the Electron Devices Society 2018-01-01

A new logic family based on ultra-thin film (10nm) nanograins (5 to 20nm) polysilicon wires (polySiNW) is proposed, validated and studied. This can be operated from 4K up 400K hybridized with conventional CMOS. Ultra low power dissipation in the order of hundreds pWs has been observed, which outperforming CMOS technology, terms consumption, by orders magnitude

10.1109/iedm.2005.1609325 article EN 2005-01-01
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