Reduced 0.418 V V OC -deficit of 1.73 eV wide-bandgap perovskite solar cells assisted by dual chlorides for efficient all-perovskite tandems

Wide-bandgap (wide- E g ) perovskites with bandgaps over 1.65 eV have great potential for constructing tandem solar cells (TSCs); however, they still suffer from large open-circuit voltage ( V OC ) deficits. Phase segregation and non-radiative recombination are great challenges for inverted wide- E...

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Published in:Energy & environmental science 2023-05, Vol.16 (5), p.2080-2089
Main Authors: Zhao, Yue, Wang, Changlei, Ma, Tianshu, Zhou, Luwei, Wu, Zhanghao, Wang, Huayang, Chen, Cong, Yu, Zhenhua, Sun, Weiwei, Wang, Aolin, Huang, Hao, Zou, Bingsuo, Zhao, Dewei, Li, Xiaofeng
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Language:English
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Summary:Wide-bandgap (wide- E g ) perovskites with bandgaps over 1.65 eV have great potential for constructing tandem solar cells (TSCs); however, they still suffer from large open-circuit voltage ( V OC ) deficits. Phase segregation and non-radiative recombination are great challenges for inverted wide- E g perovskite solar cells (PSCs) to achieve an ideal V OC and long-term operation stability. Herein, we report a synergistic strategy of using lead chloride (PbCl 2 ) and phenethylammonium chloride (PMACl) to introduce chlorine (Cl) into a bulk film and form a two-dimensional (2D) phase at the film surface for 1.73 eV wide- E g PSCs, which reduce the V OC -deficit from 0.558 V to 0.418 V. Cl in PbCl 2 enters the crystal lattice of the perovskite film, reducing the halide vacancies and suppressing ion migration. Meanwhile, PMACl facilitates the formation of a 2D perovskite phase at the grain surfaces, alleviating recombination and improving the stability. As a result, the best-performing wide- E g PSC with a high V OC of 1.312 V and an efficiency of over 20% is achieved, enabling the fabrication of two-terminal all-perovskite TSCs with a champion efficiency of 26.68%. This work provides in-depth insights into how Cl suppresses phase segregation and non-radiative recombination in wide- E g PSCs, offering a promising strategy for efficient and stable all-perovskite TSCs.
ISSN:1754-5692
1754-5706
DOI:10.1039/D2EE04087E