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Development of high-performance solution-processed chalcopyrite/kesterite films for photovoltaic application

Speaker: 
David B. Mitzi (IBM T.J. Watson Research Center)
Date: 
Tue, 16/10/2012 - 12:00pm to 1:00pm
Location: 
S13-M01-11 (Physics Conference Room)
Event Type: 
Seminars

Abstract

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 as high as 15% and 11%, 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 processing opens opportunities for development of a potentially pervasive PV technology.

 

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