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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

Polymer Science and Engineering Department Faculty Publication Series

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 …