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

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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.

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Acknowledgements

M. Z. acknowledges the Sichuan Science and Technology Program (No. 2022YFH0080). This work was also supported by scientific research starting project of SWPU (Nos. 2021QHZ005 and 2021QHZ021).

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Authors and Affiliations

  1. Institute of Photovoltaics, Southwest Petroleum University, Chengdu, 610500, China

    Wenjing Yu, Changjiang Liu, Xiaoran Sun, Tian Hou, Xin Yang, Xin Wang, Yue Yu, Kai Chen, Haijin Li, Yuelong Huang & Meng Zhang

  2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China

    Yuelong Huang & Meng Zhang

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  1. Wenjing Yu
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  2. Changjiang Liu
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  3. Xiaoran Sun
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  5. Xin Yang
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  6. Xin Wang
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  7. Yue Yu
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  10. Yuelong Huang
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Correspondence to Xiaoran Sun, Yuelong Huang or Meng Zhang.

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

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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 Res. 16, 521–527 (2023). https://doi.org/10.1007/s12274-022-4774-8

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