Dielectric screening in perovskite photovoltaics

Rui Su, Zhaojian Xu, Jiang Wu, Deying Luo, Qin Hu, Wenqiang Yang, Xiaoyu Yang, Ruopeng Zhang, Hongyu Yu, Thomas P. Russell (), Qihuang Gong, Wei Zhang () and Rui Zhu ()
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Rui Su: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University
Zhaojian Xu: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University
Jiang Wu: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University
Deying Luo: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University
Qin Hu: Polymer Science and Engineering Department, University of Massachusetts
Wenqiang Yang: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University
Xiaoyu Yang: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University
Ruopeng Zhang: National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory
Hongyu Yu: School of Microelectronics, Southern University of Science and Technology
Thomas P. Russell: Polymer Science and Engineering Department, University of Massachusetts
Qihuang Gong: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University
Wei Zhang: Advanced Technology Institute, University of Surrey
Rui Zhu: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract The performance of perovskite photovoltaics is fundamentally impeded by the presence of undesirable defects that contribute to non-radiative losses within the devices. Although mitigating these losses has been extensively reported by numerous passivation strategies, a detailed understanding of loss origins within the devices remains elusive. Here, we demonstrate that the defect capturing probability estimated by the capture cross-section is decreased by varying the dielectric response, producing the dielectric screening effect in the perovskite. The resulting perovskites also show reduced surface recombination and a weaker electron-phonon coupling. All of these boost the power conversion efficiency to 22.3% for an inverted perovskite photovoltaic device with a high open-circuit voltage of 1.25 V and a low voltage deficit of 0.37 V (a bandgap ~1.62 eV). Our results provide not only an in-depth understanding of the carrier capture processes in perovskites, but also a promising pathway for realizing highly efficient devices via dielectric regulation.

Date: 2021
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DOI: 10.1038/s41467-021-22783-z

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