![]() ![]() Historically, PV cells are made using silicon wafers (known as crystalline silicon technology), but in thin film technology, the cells are formed by growing the active layers on lower cost substrates. This has opened up the prospect of increasing the manufacturing scale thanks to more simplified process steps. Mater.The rapid expansion of photovoltaic manufacturing capacity has brought significant developments in technological capabilities, most notably the development of thin film photovoltaics (PV). Yao, et al., Single-Junction Organic Photovoltaic Cell with 19% Efficiency Adv. “Solar Cell Efficiency Tables (version 58)”, DOI: Glunz, “Reassessment of the Limiting Efficiency for Crystalline Silicon Solar Cells”, IEEE Journal of Photovoltaics 3 (2013) DOI: Shockley, Queisser, “Detailed Balance Limit of Efficiency of p-n Junction Solar Cells”, J. They will develop complementary technical skills ranging from emerging semiconductor technologies, to the characterization of optical and electronic transport phenomena in these materials and associated heterojunction devices. This thesis will give the PhD student the opportunity to expand their knowledge in solar photovoltaics and to work in a highly multidisciplinary environment involving device physics, materials science, organic electronics, and physico-chemistry. The close collaboration with the GeePs partner, in charge of numerical modeling, will help to analyse and optimise component IBC and OSC elements and the full 3T tandem solar cell. ![]() Dry processes will be developed by the LPICM partner whereas wet processes will be investigated by the PhD student to modify the c-Si interface with the goal of providing suitable surfaces (concerning roughness and wettability) for the fabrication of the organic top-cell as well as efficient collection of the electrons photogenerated in the organic top-cell (considering band alignment) (3) developing the 3T organic/Si tandem using commercial IBC Si cells. The main steps of the thesis project will consist in (1) selecting and optimising the organic top cell partner of the c-Si bottom cell (2) actively studying the organic/silicon interface to design and implement a suitable interface layer. The main goal of the thesis is to fabricate a proof of concept of an organic/Si tandem solar cell in a 3-terminal configuration based on an interdigitated back contact (IBC) silicon bottom cell and to demonstrate an improvement for the tandem cell efficiency with respect to that of either organic solar cell (OSC) or Si cell working alone. Scientific work: The thesis will take place in the framework of the ORGANIST research project (ORGANIc/Si 3-terminal Tandem solar cells) supported by the National Research Agency (ANR) in partnership with two other French laboratories (GeePs and LPICM). In this context, organic materials are very promising regarding the large choice of materials to develop either low or high band gap devices, their high absorption and the recent impressive progress in the power conversion efficiently of organic solar cells. Silicon is an appropriate low bandgap ( eV) bottom cell in a tandem configuration and there is great research activity investigating on larger bandgap semiconductors for the top cell. The dominant multijunction design today is the tandem solar cell which is achieved by combining two different bandgap materials, allowing a reduction of thermalization losses in comparison with a single junction solar cell. The development of new concepts to surpass the SQ limit is therefore a hot topic in PV research and multijunction devices are the most promising solution. A record efficiency of has been reached for the silicon single junction solar cell and only marginal improvements in performance remain possible. Solar cell efficiency is getting closer and closer to the single-junction theoretical Shockley-Queisser (SQ)efficiency limit, specifically the Auger limit of for crystalline silicon (c-Si. Context : Photovoltaics (PV) has today become a mature industry, dominated by silicon technology (more than 90% of the PV market). ![]()
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