Polymer-Passivated Inorganic Cesium Lead Mixed-Halide Perovskites for Stable and Efficient Solar Cells with High Open-Circuit Voltage over 1.3 V.

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dc.creatorZeng, Qingsen
dc.creatorZhang, Xiaoyu
dc.creatorFeng, Xiaolei
dc.creatorLu, Siyu
dc.creatorChen, Zhaolai
dc.creatorYong, Xue
dc.creatorRedfern, Simon AT
dc.creatorWei, Haotong
dc.creatorWang, Haiyu
dc.creatorShen, Huaizhong
dc.creatorZhang, Wei
dc.creatorZheng, Weitao
dc.creatorZhang, Hao
dc.creatorTse, John S
dc.creatorYang, Bai
dc.date2018-02-13T15:32:49Z
dc.date2018-02-13T15:32:49Z
dc.date2018-03
dc.date.accessioned2026-08-03T02:12:19Z
dc.descriptionCesium-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 CsPbI2 Br absorber and polythiophene hole-acceptor to minimize the Eloss is reported. It is demonstrated that polythiophene, deposited on the top of CsPbI2 Br, 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 .
dc.formatPrint-Electronic
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dc.formatapplication/pdf
dc.identifier0935-9648
dc.identifierhttps://www.repository.cam.ac.uk/handle/1810/273194
dc.identifier10.17863/CAM.20200
dc.identifier1521-4095
dc.identifier.urihttps://repo.dare.co.zw/handle/123456789/164886
dc.languageeng
dc.languageeng
dc.publisherWiley
dc.publisherhttps://doi.org/10.1002/adma.201705393
dc.subjectdefect states
dc.subjectenergy disorder
dc.subjectenergy loss
dc.subjectinorganic perovskites
dc.subjectnanocrystals
dc.subjectpolymers
dc.subjectsolar cells
dc.subjectsurface passivation
dc.titlePolymer-Passivated Inorganic Cesium Lead Mixed-Halide Perovskites for Stable and Efficient Solar Cells with High Open-Circuit Voltage over 1.3 V.
dc.typeArticle

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