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    Promoting the Efficiency and Stability of CsPbIBr2-Based All-Inorganic Perovskite Solar Cells through a Functional Cu2+Doping Strategy

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    Authors
    Liu, P.
    Yang, X.
    Chen, Y.
    Xiang, H.
    Wang, Wei
    Ran, R.
    Zhou, W.
    Shao, Zongping
    Date
    2020
    Type
    Journal Article
    
    Metadata
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    Citation
    Liu, P. and Yang, X. and Chen, Y. and Xiang, H. and Wang, W. and Ran, R. and Zhou, W. et al. 2020. Promoting the Efficiency and Stability of CsPbIBr2-Based All-Inorganic Perovskite Solar Cells through a Functional Cu2+ Doping Strategy. ACS Applied Materials and Interfaces. 12 (21): pp. 23984-23994.
    Source Title
    ACS Applied Materials and Interfaces
    DOI
    10.1021/acsami.0c04938
    ISSN
    1944-8244
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150104365
    http://purl.org/au-research/grants/arc/DP160104835
    URI
    http://hdl.handle.net/20.500.11937/91957
    Collection
    • Curtin Research Publications
    Abstract

    Although organic-inorganic halide perovskite solar cells (PSCs) have shown dramatically enhanced power conversion efficiencies (PCEs) in the last decade, their long-term stability is still a critical challenge for commercialization. To address this issue, tremendous research efforts have been devoted to exploring all-inorganic PSCs because of their intrinsically high structural stability. Among them, CsPbIBr2-based all-inorganic PSCs have drawn increasing attention owing to their suitable band gap and favorable stability. However, the PCEs of CsPbIBr2-based PSCs are still far from those of their organic-inorganic counterparts, thus inhibiting their practical applications. Herein, we demonstrate that by simply doping an appropriate amount of Cu2+ into a CsPbIBr2 perovskite lattice (0.5 at. % to Pb2+), the perovskite crystallinity and grain size are increased, the perovskite film morphology is improved, the energy level alignment is optimized, and the trap density and charge recombination are reduced. As a consequence, a decent PCE improvement from 7.81 to 10.4% is achieved along with an enhancement ratio of 33% with a CsPbIBr2-based PSC. Furthermore, the long-term stability of CsPbIBr2-based PSCs against moisture and heat also remarkably improved by Cu2+ doping. This work provides a facile and effective route to improve the PCE and long-term stability of CsPbIBr2-based all-inorganic PSCs.

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