ChemInform Abstract: Synthesis of (CuInS₂)_0.5(ZnS)_0.5 Alloy Nanocrystals and Their Use for the Fabrication of Solar Cells via Selenization.

Abstract

5(ZnS)0.5 is prepared by hot injecting stoichiometric amounts of a solution of Cu(acac) 2, In(acac)3, and Zn(acac)2 in oleylamine and an oleylamine solution of S into a preheated reaction vessel also containing oleylamine (250 C, 15 min). The powder is then used as an ink for doctor blading of a Mo-coated soda lime glass substrate followed by selenization at 500 C resulting in a dense (CuIn(S,Se) 2)0.5(Zn(S,Se))0.5 (CZISSe) absorber layer containing micrometer sized grains. The obtained films are fabricated into photovoltaic devices following a standard device architecture: Mo (800 nm)/CZISSe (700-1000 nm)/CdS (50 nm)/intrinsic-ZnO (80 nm)/ITO (220 nm)/Ni-Al grids with a device area of 0.47 cm 2 . The best completed solar cell reaches a total area power conversion efficiency of 6.7%, or 7.4% based on the active area when accounting for shadowing effects due to the Ni-Al grid. -(GRAESER, B. K.; HAGES, C. J.; YANG, W. C.; CARTER, N. J.; MISKIN, C. K.; STACH, E. A.; AGRAWAL*, R.; Chem. Mater. 26 (2014) 14, 4060-4063, http://dx.doi.org/10.1021/cm501017z ; Sch. Chem. Eng., Purdue Univ., West Lafayette, IN 47907, USA; Eng.) -J. Schramke 40-007