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Nat Commun. 2014 May 12;5:3834. doi: 10.1038/ncomms4834.

Inorganic hole conductor-based lead halide perovskite solar cells with 12.4% conversion efficiency.

Author information

1
Department of Chemistry and Chemical Engineering, Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology, Station 6, CH-1015 Lausanne, Switzerland.
2
Department of Electric Engineering and Computer Science, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji 671-2280, Hyogo, Japan.
3
Energy Technology Laboratories, Osaka Gas Co., Ltd., 6-19-9 Torishima, Konohana-Ku 554-0051, Osaka, Japan.

Abstract

Organo-lead halide perovskites have attracted much attention for solar cell applications due to their unique optical and electrical properties. With either low-temperature solution processing or vacuum evaporation, the overall conversion efficiencies of perovskite solar cells with organic hole-transporting material were quickly improved to over 15% during the last 2 years. However, the organic hole-transporting materials used are normally quite expensive due to complicated synthetic procedure or high-purity requirement. Here, we demonstrate the application of an effective and cheap inorganic p-type hole-transporting material, copper thiocyanate, on lead halide perovskite-based devices. With low-temperature solution-process deposition method, a power conversion efficiency of 12.4% was achieved under full sun illumination. This work represents a well-defined cell configuration with optimized perovskite morphology by two times of lead iodide deposition, and opens the door for integration of a class of abundant and inexpensive material for photovoltaic application.

PMID:
24815001
DOI:
10.1038/ncomms4834
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