Date: Thursday, Jan 26th
Presenter: David Mitzi, IBM
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 the development of a relatively simple liquid-based deposition process that has enabled the fabrication of high-performance CuIn1-xGaxSe2-ySy (CIGS) and Cu2ZnSnSe4-ySy (CZTS) absorber layers, with resulting device power conversion efficiencies of 15.2% and 10.1%, respectively. The devices are compared using a variety of physical characterization tools, including temperature-dependent J-V, external 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 pro- cessing opens opportunities for development of a potentially pervasive technology.
Dr. Mitzi is a Research Staff Member in the Physical Sciences Department at the IBM Thomas J. Watson Research Center. His most recent research concerns organic-inorganic hybrids and the development of solution-processed inorganic semiconductors for thin-film devices. Dr. Mitzi holds numerous patents and has authored or coauthored over one hundred papers.