Development of High-Performance Solution-Processed Chalcopyrite/Kesterite Films for Photovoltaic Application
a IBM TJ Watson Research Center, PO Box 218 10598 Yorktown Heights, New York
Proceedings of International Conference Solution processed Semiconductor Solar Cells (SSSC14)
Organizers: Henry Snaith and Samuel Stranks
Invited Speaker, David Mitzi, presentation 089
Publication date: 1st July 2014
Publication date: 1st July 2014
While chalcopyrite and kesterite materials offer a promising pathway toward commercialized photovoltaic technology, the complicated multi-element nature of these materials generally leads to the requirement of more complex and costly deposition processes. This talk will focus on recent developments relating to a relatively simple solution-based deposition process that has enabled the fabrication of high-performance CuIn1-xGaxSe2-ySy (CIGS) and Cu2ZnSnSe4-ySy (CZTS) absorber layers, using hydrazine as a solvent, with resulting device power conversion efficiencies of as high as 15% and 12.6%, respectively. The devices are compared using a variety of physical characterization tools, including temperature-dependent J-V, quantum efficiency and capacitance spectroscopy, leading to a better understanding of factors limiting device performance. For CZTS, the combination of new record efficiency, earth abundant metal starting materials, and solution-based processing opens opportunities for development of a scalable and low-cost PV technology. A key remaining hurdle to achieving this goal is overcoming the high open circuit voltage deficit (i.e., Eg – Voc value) observed in these devices.
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