Polymer-passivated inorganic CsPbI2Br perovskites toward efficient photovoltaics with low energy losses.

Zeng, Q. and Zhang, X. and Feng, Xiaolei and Lu, S. and Chen, Z. and Yong, X. and Redfern, S. A. T. and Wei, H. and Wang, H. and Zheng, W. and Zhang, H. and Tse, J. S. and Yang, B. (2017) Polymer-passivated inorganic CsPbI2Br perovskites toward efficient photovoltaics with low energy losses. Advanced Materials, 30 (9). ISSN 0935-9648 1521-4095 DOI https://doi.org/10.1002/adma.201705393

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Cesium‐based trihalide perovskites have been demonstrated as promising light absorbers for photovoltaic applications due to their superb composition stability. However, the large energy losses (Eloss) observed in inorganic perovskite solar cells has become a major hindrance impairing the ultimate efficiency. Here, an effective and reproducible method of modifying the interface between a CsPbI2Br absorber and polythiophene hole‐acceptor to minimize the Eloss is reported. It is demonstrated that polythiophene, deposited on the top of CsPbI2Br, can significantly reduce electron‐hole recombination within the perovskite, which is due to the electronic passivation of surface defect states. In addition, the interfacial properties are improved by a simple annealing process, leading to significantly reduced energy disorder in polythiophene and enhanced hole‐injection into the hole‐acceptor. Consequently, one of the highest power conversion efficiency (PCE) of 12.02% from a reverse scan in inorganic mixed‐halide perovskite solar cells is obtained. Modifying the perovskite films with annealing polythiophene enables an open‐circuit voltage (VOC) of up to 1.32 V and Eloss of down to 0.5 eV, which both are the optimal values reported among cesium‐lead mixed‐halide perovskite solar cells to date. This method provides a new route to further improve the efficiency of perovskite solar cells by minimizing the Eloss.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA73;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Advanced Materials
Volume: 30
Identification Number: https://doi.org/10.1002/adma.201705393
Depositing User: Sarah Humbert
Date Deposited: 25 Nov 2017 22:51
Last Modified: 10 Mar 2021 22:16
URI: http://eprints.esc.cam.ac.uk/id/eprint/4079

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