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Research Article

Spontaneous relaxation of 2D passivation layer contributes to the aging-induced performance enhancement of perovskite solar cells

Wenjing Yu1, Changjiang Liu1, Xiaoran Sun1( ), Tian Hou1, Xin Yang1, Xin Wang1, Yue Yu1, Kai Chen1, Haijin Li1, Yuelong Huang1,2( ), Meng Zhang1,2( )
Institute of Photovoltaics, Southwest Petroleum University, Chengdu 610500, China
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
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Graphical Abstract

The PBA-based two-dimensional (2D) passivation layer which formed without any heat-treatment undergoes unassisted spontaneous relaxation from a small n-value state to large n-value state.

Abstract

The aging-induced performance enhancement of the perovskite solar cells (PSCs) has been considered to be associated with the oxidation progress of the hole-transporting layer. Whereas the influence of the structural evolution of the passivation layer is underestimated. In this work, a spontaneous relaxation of two-dimensional (2D) passivation layer with increased n-value structure is observed, which can be accelerated under ambient atmosphere. It is demonstrated that device with relaxed 2D passivation layer exhibits reduced non-radiative recombination and optimized charge transfer property, contributing substantially to the aging-induced performance enhancement in 2D-3D heterostructured PSCs. Finally, a high fill factor of 84.15% of the devices is obtained with the relaxed 2D passivation layer, suggesting the spontaneous relaxation of 2D passivation layer is playing a key role in achieving high quality optoelectronic devices.

Keywords

perovskite solar celltwo-dimensional (2D) perovskiterelaxationagingpassivation

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Nano Research
Volume 16 Issue 1,
January 2023
Pages 521-527
DOI: 10.1007/s12274-022-4774-8
Cite this article:
Yu W, Liu C, Sun X, et al. Spontaneous relaxation of 2D passivation layer contributes to the aging-induced performance enhancement of perovskite solar cells. Nano Research, 2023, 16(1): 521-527. https://doi.org/10.1007/s12274-022-4774-8
Topics:
Perovskite solar cells

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Received: 24 April 2022
Revised: 13 July 2022
Accepted: 14 July 2022
Published: 08 August 2022
© Tsinghua University Press 2022
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