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Reference : UPR2940-FLOPOI-029
Workplace : GRENOBLE
Date of publication : Monday, June 22, 2020
Scientific Responsible name : David EON
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Thanks to its ultimate intrinsic properties, diamond is the semiconductor material with the best prospects for power electronic devices. It has an unexploited potential for a higher voltage range, low losses and increased frequency of active components for the conversion of electrical energy. There are many opportunities for more clean and efficient energy thanks to new components in diamond technology. As part of the project funded by the French National Research Agency (ANR Trans Diam), coordinated by CEA Leti with the NEEL Institute (CNRS and the University of Grenoble Alpes) as a partner, the laboratory is opening a PhD position in the field of diamond devices.
The project is based on recent results, notably from the NEEL Institute, which have shown that the potential of diamond is a scientific and technical reality, however diamond is still not an industrial reality in the field of electronics. There are several reasons for this, including
- The challenge of synthesizing electronic-grade single crystal diamond in large dimensions. In 2020, diamond exists only in a square substrate of 1 cm² at the most.
- The cost of monocrystalline diamond substrates. A sample of synthesized monocrystalline diamond of 4x4 mm² costs about $400.
- The availability of high quality, ultra-pure homo-epitaxial diamond thin films for the manufacture of diamond power devices.
The goal of this project is to make diamond an industrial reality in electronics. The work of the PhD student will be to actively participate in this collaborative work (CEA expert in thin film transfer and bonding, NEEL expert in diamond power components and DiamFab as an industrial expert in growth of homoepitaxial diamond).
In interaction with the partners, the PhD student will be mainly in charge of the design and the realization in clean room of electronic components on the new diamond substrates imagined in the project. Then, he will have to carry out measurement campaigns to characterize the component as well as the material. The aim is to extract data allowing to make relevant relations between the electrical and physical characteristics of the material in order to help its improvement; with the objective of demonstrating the feasibility of the approach defended in the project.
The main actions to be carried out by the PhD student during the thesis are :
- Work in clean room with the main techniques such as lithography, etching, metal deposition and chemical cleaning processes, for the realization of Schottky diodes.
- Physical characterization of layers and stacking (SEM, TEM, AFM, ellipsometry, optical profilometry, EBIC, cathodoluminescence)
- Electrical characterization (current, capacitance-voltage)
- Interpretation and reporting of results
Most of the work will be carried out at the NEEL Institute and in the Wide band gap Semiconductor team, which has several electrical characterization techniques. The generic facilities of the laboratory will be available for the PhD student to carry out his research activities. In particular, the shared clean room and EBIC/cathodoluminescence characterization facilities. The PhD student will also interact locally with the company DiamFab which is a young startup resulting from the team's research work.
- Intrinsic motivation for research and experimentation
- Proven expertise in semiconductors
- Very good knowledge of semiconductor physics required.
- Knowledge of solid-state physics, surface and material chemistry is important.
- Fluency in English is required and we are looking for comfortable profiles in a collaborative work in a multidisciplinary environment.
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