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

Peng Qin, Soichiro Tanaka, Seigo Ito (), Nicolas Tetreault, Kyohei Manabe, Hitoshi Nishino, Mohammad Khaja Nazeeruddin () and Michael Grätzel
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Peng Qin: Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology
Soichiro Tanaka: Graduate School of Engineering, University of Hyogo
Seigo Ito: Graduate School of Engineering, University of Hyogo
Nicolas Tetreault: Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology
Kyohei Manabe: Energy Technology Laboratories, Osaka Gas Co., Ltd.
Hitoshi Nishino: Energy Technology Laboratories, Osaka Gas Co., Ltd.
Mohammad Khaja Nazeeruddin: Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology
Michael Grätzel: Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms4834

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