Low-Temperature and Solution-Processed Amorphous WO X as Electron-Selective Layer for Perovskite Solar Cells

The electron-selective layer (ESL) is an indispensable component of perovskite solar cells (PSCs) and is responsible for the collection of photogenerated electrons. Preparing ESL at a low temperature is significant for future fabrication of flexible PSCs. In this work, solution-processed amorphous W...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2015-03, Vol.6 (5), p.755-759
Main Authors: Wang, Kai, Shi, Yantao, Dong, Qingshun, Li, Yu, Wang, Shufeng, Yu, Xufeng, Wu, Mengyao, Ma, Tingli
Format: Article
Language:English
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Summary:The electron-selective layer (ESL) is an indispensable component of perovskite solar cells (PSCs) and is responsible for the collection of photogenerated electrons. Preparing ESL at a low temperature is significant for future fabrication of flexible PSCs. In this work, solution-processed amorphous WO x thin film was prepared facilely at low temperature and used as ESL in PSCs. Results indicated that a large quantity of nanocaves were observed in the WO x thin film. In comparison with the conventional TiO2 ESL, the WO x ESL exhibited comparable light transmittance but higher electrical conductivity. Compared with the TiO2-based PSCs, PSCs that use WO x ESL exhibited comparable photoelectric conversion efficiency, larger short-circuit current density, but lower open-circuit voltage. Electrochemical characterization indicated that the unsatisfied open-circuit voltage and fill factor were caused by the inherent charge recombination. This study demonstrated that this material is an excellent candidate for ESL.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.5b00010