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Technique for Achieving Large-Grain Ag2ZnSn(S,Se)4 Thin Films

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Techniques for increasing grain size in AZTSSe absorber materials are provided. In one aspect, a method for forming an absorber film on a substrate includes: contacting the substrate with an Ag source, a Zn source, a Sn source, and an S source and/or an Se source under conditions sufficient to form the absorber film on the substrate having a target composition of: Ag.sub.XZn.sub.YSn(S,Se).sub.Z, wherein 1.7<x<2.2, 0.9<y<1.3, and 3.5<z<4.5, and including an amount of the Ag source that is from about 10% to about 30% greater than is needed to achieve the target composition; annealing the absorber film; and removing excess Ag from the absorber film. A solar cell and method for fabrication thereof are also provided.
Gershon, Talia S. (White Plains, NY), Gordon, Michael S. (Yorktown Heights, NY), Lee, Yun Seog (White Plains, NY)
15/ 198,795
June 30, 2016
STATEMENT OF GOVERNMENT RIGHTS [0001] This invention was made with Government support under Contract number DE-EE0006334 awarded by Department of Energy. The Government has certain rights in this invention.