Materials Physics and Electrical Performances (Thèse)
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HIGHLY EFFICIENT TERAHERTZ DEVICES FOR NANO-ELECTRONICS QUANTUM TECHNOLOGY (POST-DOC) Start date : 01/10/2021 offer n°IMEPLAHC-PHOTO-09-16-2021 IMEP-LAHC, CNRS, Chambéry, France Post-doctoral position in Highly efficient Terahertz devices for Nano-Electronics Quantum Technology We are seeking for a post- doctoral fellow in the frame of the project STEPforQubits (Short TeraHertz Electrical Pulses for Qubits) funded by the french ANR agency. Context: The most recent developments of quantum electronic circuits made from 2D electron gas (2DEG) will make possible the demonstration of novel and fundamental experiments such as electron “quantum optics” experiments where single electron would behave as a single photon emitted in a quantum optical system [1]. However, in order to perform such fascinating experiments, it is required to excite, control and detect single electrons within a time-scale well below the nanosecond range. For that, we intend to use ultrafast optoelectronics as a generation technique of picosecond electrical pulses and to associate it with quantum electronics in 2DEG circuits. Today, the use of femtosecond lasers allows for the generation of electrical pulses with duration lower than a picosecond and frequency components in the THz range. This technique is commonly based on GaAs photoconductive switches and it is routinely used for THz experiment [2]. However, to our knowledge, it has never been successfully applied to the study of quantum electronic circuits. Hence, in this project we would like to build a new technological approach for quantum-technology by integrating quantum 2DEG circuits with highly efficient optoelectronic devices capable of generating picosecond electrical pulses with on-demand duration and amplitude. Objectives of the postdoctoral fellowship: The research work is focused on the development and experimental characterization of a new class of highly efficient photoconductive devices based on GaAs technology. The design of the component takes advantage of nano-photonic and plasmonic techniques in order to increase its efficiency [3]. After assessment of their performances, the devices will be co-integrated with a 2DEG circuit in order to demonstrate a first quantum experiment. Then,further developments toward new functionalities of the photoconductive devices will be addressed. Collaboration and networking : The research will be done by the group PHOTO at IMEP-LAHC, University Savoie Mont-Blanc in Chambéry in collaboration with the group QuantECA in the Neel Institute, CNRS in Grenoble . Both groups enjoy international renown in their discipline. They are fully equipped with high speed electronics, lasers, THz benches, cryogenic instrumentation, clean room and nanofabrication facilities. Required profile: We are looking for a post graduate researcher with a PhD in Physics, Optics or Electronics. A previous experience in experimental THz optics, ultrafast laser science, integrated optics or optoelectronics will be of advantage. The successful post-doctoral fellow should have a background in at least one of the following fields: THz optics, ultrafast optics, optoelectronics, semiconductors components. The candidate should have demonstrated his-her ability for interdisciplinary collaboration with researchers and a corresponding track record of publications. To apply for this position, please send your application as one single PDF file to Dr. J. F. Roux (see coordinates below). The application should contain a motivation letter including a short exposé with an outline of your research interests, CV, Master and PhD certificates and 2 reference contacts. Foreseen start for the position: autumn 2021 Net Salary (after taxes): Approximatively 2000 € per month Duration:18 months Contact :Dr. Jean-Francois ROUX, [email protected] [1] Bauerle et al. 2018 Rep. Prog. Phys. 81 056503 [2] Eusebe et al. 2005 JAP 98, 033711 [3] Georgiou et al. ArXiV: 2001.01341 Laboratory: FMNT / IMEP-LaHc Code CEA : IMEPLAHC-PHOTO-09-16-2021 Contact : [email protected] LOW TEMPERATURE SEMICONDUCTOR LAYER TRANSFER FOR 3D SEQUENTIAL INTEGRATION: MATERIALS PHYSICS AND ELECTRICAL PERFORMANCES (THÈSE) Start date : 01/09/2021 offer n°IMEPLAHC-CMNE-06-16-2021 Low temperature semiconductor layer transfer for 3D sequential integration: materials physics and electrical performances The fabrication of integrated circuits with multiple stacked transistor layers, or sequential 3D integration, allows for ultra-dense vertical connectivity, tackling wire delay problems and increase the number of transistors per unit area without requiring costly feature size reduction. A major challenge for 3D sequential integration is that it requires limiting the thermal budget of top layer devices processing to ensure the stability of the bottom layer devices. At LETI, we are developing different alternatives to obtain the top Si layer “substrate” at low temperature (LT). To understand the physics and qualify the performances of LT substrates, a pertinent electrical characterization method is needed. With this in mind, we have recently developed a new test vehicle configured as a double-gate pseudo-MOSFET structure (DG-ΨMOSFET [SSE 2021 and INFOS 2021]), and demonstrate the pertinence of this device for parameter extraction of SOI. In another recently accepted communication [VLSI 2021] we report excellent electrical results with advanced devices integrated on a first generation of LTSOI. These preliminary studies set the basis for the thesis. The work will rely on two major aspects: (i) deliver a complete understanding of the new DG-ΨMOSFET device behavior and adapted electrical parameters extraction, and; (ii) use the electrical vehicle, and complementary physical characterization methods, to understand the materials physics for 3D substrate level integration and its compatibility with devices integration. The work is organized such as the fabrication and physical characterization of the substrates and devices will be done in CEA- LETI. The electrical characterization of the devices will be done in IMEP-LaHC. CEA-LETI, in Grenoble, capital of the french alps, is an institute dedicated to applied research in micro- and nano- technologies, information technologies and technologies for healthcare. LETI is the privileged interface between industry and academia. Through research programs using worl-leading technology patforms, it ensures the development and industrial transfer of innovative technologies in a wide range of sectors. IMEP-LaHC, is a « unité mixte de recherche » (CNRS / Grenoble INP / UGA / Université Savoie Mont Blanc) of 110 people strongly committed in research activities related to micro- and nano-electronics, microphotonics, micro- and nano-systems, microwaves and microwave-photonics. Requested skills: the candidate must have good knowledge on semiconductor materials and device physics, an experience on technological process, on electrical parameter extraction is a plus. She/he must be curious, self-motivated and autonomous, in order to fully benefit from this collaborative thesis in a highly technological environment. Contacts: Shay Reboh ([email protected]) Irina Ionica ([email protected] Laboratory: FMNT / IMEP-LaHc Code CEA : IMEPLAHC-CMNE-06-16-2021 Contact : [email protected] INTEGRATED PHOTONIC SENSOR ON GLASS FOR DETECTING BACTERIAL VIABILITY IN POLLUTED WATER (THÈSE) Start date : 01/09/2021 offer n°IMEPLAHC-PHOTO-04-07-2021 Sujet de thèse pour contrat doctoral fléché EEATS Integrated photonic sensor on glass for detecting bacterial viability in polluted water The adverse effects of technological and industrial accidents on health and environment lead public authorities and the private sector to develop solutions able to measure the generated pollution. The fire of the Lubrizol factory in Rouen has for instance highlighted that the currently available techniques are slow. Indeed, it took several days to analyze the first samples of contaminated water and soil. The development of portable and robust sensors able to characterize the toxicity of pollutants in real time in a liquid phase is therefore a major challenge. Solutions based on a functionalization of the detection region are in general proposed. However, exploiting chromogenic markers, expensive and potentially dangerous for the environment¹ greatly penalizes the durability and the environmental footprint of those detectors. The objective is therefore to design an integrated sensor that is robust, easy to clean and that does not require any functionalization of the sensitive region. In this context, the IMEP-LaHC, specialist of integrated photonic²,³ and optofluidic devices4, has teamed up with laboratories offering complementary skills. The goal is to propose an integrated solution based on a detection of bacterial viability, where bacteria play the role of sentinels for pollution of the analysed medium. Specialists in microbiology (laboratories LMSM, IGE, COBRA) and integrated sensors (IMEP-LaHC, G2Elab) compose the consortium. The ambition is to develop a solution on a glass substrate, well known and widely exploited by biologists, thanks to its mechanical and chemical robustness. The sensor will co-integrate two detection functions, optical and electrical. They will measure independently and redundantly the viability of bacterial solutions contaminated with pollutants. The goal of this PhD is to work on the design and optimization of the optical sensing function. The innovative approach will exploit the advantages