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Reference : UMR7334-DELSTU-025
Workplace : MARSEILLE 13
Date of publication : Monday, September 07, 2020
Type of Contract : FTC Technical / Administrative
Contract Period : 6 months
Expected date of employment : 1 November 2020
Proportion of work : Full time
Remuneration : A monthly salary before taxes between 2151.31 et 2272.27€ according to the applicant experinces
Desired level of education : 5-year university degree
Experience required : Indifferent
The successful candidate will characterize the optical and electrical properties of rectennas developped at IM2NP in the frame of a Research and Development project funded by the French Spatial Agency (CNES, Centre National d'Etudes Spatiales).
The optical properties of plasmonic nano-antennas will be characterized for wavelengths ranging between 300nm and 2µm using a spectrophotometer equipped with an integrating sphere. Electrical measurements under illumination will be performed at a nanometric scale using a conductive AFM equipped with a super-continuum laser. Macroscopic electrical characterizations will be also performed on the devices.
We are seeking applicants with a background in: material sciences, opto-electronic characterization and nano-photonic. Good English level required. Candidates with experience in electrical characterization of semi-conductors are of particular interest. A good knowledge of experimental set-ups including advanced characterization by conductive AFM is encouraged. She/he is dynamic and a self-starter.
The successful applicant will join the LUMEN-PV team at IM2NP.
The “Institut Matériaux Microélectronique Nanosciences de Provence” – IM2NP is one of the main research institutes of Aix-Marseille University (www.im2np.fr). With more than 320 scientists, engineers, technicians, PhD students in physics, chemistry and micro-electronics, the Institute gathers the required expertise for research and education in materials, microelectronics and nanosciences and supports a wide range of programs including modelling, design, architecture, processes, materials and their physico-chemical properties. At the IM2NP, the LUMEN-PV team (Light Ultimate MatErials Nanodevices and PV) is gathering 7 permanent staff and 5 PhD students. The team activity is focused on the physics of the conversion of photons into electrons with applications in photonic sensors and photovoltaics. Work performed during the past years in the LUMEN-PV team deals with the optical and electrical modeling of thin film photovoltaic cells, such as organic solar cells, CIGS solar cells and Kesterite solar cells. Another field of research, closely connected to the previous one, concerns the development of innovating photonic architectures comprising plasmonic structures and photonic crystals, or light trapping in organic solar cells and photonic metamaterials for optical filtering and anti-reflective applications. The LUMEN-PV has already studied high-frequency rectennas working in the visible and near-infrared range within the ETNA project (Energy Through NanoAntenna – 2016 - 2018) funded by Aix-Marseille University foundation AMIDEX.
The LUMEN-PV team develops rectennas working at optical frequencies and composed of plasmonic nano-antennas connected with ultra high speed diodes as rectifying elements. More and more applications, including spatial applications, require the development of photovoltaic (PV) devices that are efficient, flexible and light. For specific applications such as spatial applications or more generally for aerial vehicles, the generated power-to-weight ratio of systems is a crucial criterion. Traditional light and flexible PV systems reach efficiencies around 30% but a further improvement of efficiency would require an extension of their working spectral range on the whole solar spectrum (300nm – 2500nm), which remains a challenge.
A promising solution, coming from the microwave community, concerns the development of rectified nano-antennas also called rectennas. Rectennas are composed of nano-antennas working at optical frequencies and connected with rectifying elements allowing to transform an alternative current (AC) in a direct current (DC). The mechanisms involved in rectennas relies on the wave properties of light. When an electromagnetic wave at optical frequencies (10^14 – 10^15 Hz) is captured by a metallic nano-antenna, it induces the generation of plasmonic waves and thus the generation of a high frequency AC current in the metal which can be transformed in a usable DC current by a high speed rectifying element. This method could be applied to rectify electromagnetic waves from the infrared to the visible region of the solar spectrum with theoretical conversion efficiencies of 85%. Rectennas operating at tens of GHz and near THz have been demonstrated with efficiencies around 40 – 50% and proof of concepts of optical rectennas working at optical frequencies have been clearly established. Furthermore, this technology uses a very small amount of materials and is compatible with flexible and light substrates which make it a good candidate for spatial applications.
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