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Vol. 14 (2022)

Surface Passivation and Energetic Modification Suppress Nonradiative Recombination in Perovskite Solar Cells

https://doi.org/10.1007/s40820-022-00854-0
Wei Dong
Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200241, People’s Republic of China
Wencheng Qiao
Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200241, People’s Republic of China
Shaobing Xiong
School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People’s Republic of China
Jianming Yang
School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People’s Republic of China
Xuelu Wang
Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200241, People’s Republic of China
Liming Ding
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China
Yefeng Yao
Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200241, People’s Republic of China
Qinye Bao
School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People’s Republic of China

Corresponding Author: Qinye Bao

qybao@clpm.ecnu.edu.cn

Nano-Micro Letters, Vol. 14 (2022), Article Number: 108

Abstract

Surface passivation via post-treatment is an important strategy for improving power conversion efficiency and operational stability of perovskite solar cells. However, so far the interaction mechanisms between passivating additive and perovskite are not well understood. Here, we report the atomic-scale interaction of surface passivating additive 2,2-difluoroethylammonium bromine (2FEABr) on the MAPbI3. It is found that the bulky 2FEA+ cations tend to distribute at film surface, while the Br− anions diffuse from surface into bulk. A combination of 19F, 207Pb, and 2H solid-state NMR further reveal the Br− anions’ partial substitution for the I− sites, the restricted motion of partial MA+ cations, and the firmed perovskite lattices, which would improve charge transport and stability of the perovskite films. Optical spectroscopy and ultraviolet photoelectron spectroscopy demonstrate that the 2FEABr induced surface passivation and energetic modification suppress the nonradiative recombination loss. These findings enable the efficiency of the p-i-n structured PSC significantly increasing from 19.44 to 21.06%, accompanied by excellent stability. Our work further establishes more knowledge link between passivating additive and PSC performance.


Highlights:


1 The partial substitution of Br− on I-sites, and the restricted motion of MA+ cations in correlation with suppressed electron-phonon coupling promote charge transport.
2 The perovskite parent lattice of 2FEABr-treated perovskites was firmed, and the difficulty degree for A-site MA+ cations running out of the inorganic framework was thus enhanced.
3 The efficiency was enhanced from 19.44% to 21.06%, accompanied with excellent stability.

Keywords

Passivation Solid-state NMR Charge transport Perovskite solar cell
Dong, Wei, Wencheng Qiao, Shaobing Xiong, Jianming Yang, Xuelu Wang, Liming Ding, Yefeng Yao, and Qinye Bao. 2022. “Surface Passivation and Energetic Modification Suppress Nonradiative Recombination in Perovskite Solar Cells”. Nano-Micro Letters 14 (April):108. https://doi.org/10.1007/s40820-022-00854-0.
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