Thin Film Solar Cells. New Organic Materials, Large-scale Printing and Nanoparticles
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In this seminar I will present three main areas of our work on solution processed solar cells. In part one I will describe the development of new donor and acceptor materials for solution processed organic photovoltaics (OPVs). In particular, I will discuss the issue of molecular association with regards to small molecule donor materials and its effect on the open circuit voltage. I will also introduce a new class of small molecule semiconductors based on solubilised indene derivatives and their use as acceptor materials in solution processed bulk heterojunction OPVs. In part two, I will describe our work on large scale printing of organic solar cells. Finally, in part three, I will present our work on the fabrication of thin film solar cells based on nanocrystal inks of CdTe. We have shown that totally solution processable solar cells can be fabricated in air at temperatures as low as 300 °C. Focusing on a CdTe/ZnO thin-film system, we report solar cells that achieve power conversion efficiencies of upto 10% with greater than 90% internal quantum efficiency.