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Title: Low temperature fabrication for high performance flexible CsPbI2Br perovskite solar cells
Authors: Jiang, H
Feng, JS
Zhao, H
Li, GJ 
Yin, GN
Han, Y
Yan, F 
Liu, ZK
Liu, SZ
Keywords: CsPbI2Br
High performance
High stability
Low temperature
Issue Date: 2018
Publisher: Wiley-VCH
Source: Advanced science, Nov. 2018, v. 5, no. 11, 1801117, p. 1-8 How to cite?
Journal: Advanced science 
Abstract: All-inorganic CsPbX3-based perovskites, such as CsPbI2Br, show much better thermal and illumination stability than their organic-inorganic hybrid counterparts. However, fabrication of high-quality CsPbI2Br perovskite film normally requires annealing at a high temperature (>250 degrees C) that is not compatible with the plastic substrate. In this work, a Lewis base adduct-promoted growth process that makes it possible to fabricate high quality CsPbI2Br perovskite films at low temperature is promoted. The mechanism is attributed to synthesized dimethyl sulfoxide (DMSO) adducts which allow a low activation energy route to form CsPbI2Br perovskite films during the thermal annealing treatment. A power conversion efficiency (PCE) of 13.54% is achieved. As far as it is known, this is the highest efficiency for the CsPbI2Br solar cells fabricated at low temperature (120 degrees C). In addition, the method enables fabrication of flexible CsPbI2Br PSCs with PCE as high as 11.73%. Surprisingly, the bare devices without any encapsulation maintain 70% of their original PCEs after being stored in ambient air for 700 h. This work provides an approach for preparing other high performance CsPbX3-based perovskite solar cells (PSCs) at low temperature, particularly for flexible ones.
ISSN: 2198-3844
DOI: 10.1002/advs.201801117
Rights: © 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License (, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
The following publication Jiang, H., Feng, J. S., Zhao, H., Li, G. J., Yin, G. N., Han, Y., . . . Liu, S. Z. (2018). Low temperature fabrication for high performance flexible cspbi2br perovskite solar cells. Advanced Science, 5(11), 1801117, 1-8 is available at
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