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Research Article | Open Access

Synchronous defect passivation of all-inorganic perovskite solar cells enabled by fullerene interlayer

Yanbo Shang1Pu Wang1Lingbo Jia1Xingcheng Li1Weitao Lian1Peisen Qian1Muqing Chen2Tao Chen1Yalin Lu1Shangfeng Yang1( )
CAS Key Laboratory of Materials for Energy Conversion, Anhui Laboratory of Advanced Photon Science and Technology, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
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Graphical Abstract

A bis-dimethylamino-functionalized fullerene derivative PCBDMAM is incorporated as an interlayer between ZnO electron transport layer and all-inorganic CsPbI2.25Br0.75 perovskite layer, resulting in synchronous defect passivations of both layers and consequently dramatic enhancements of efficiency and thermal stability of perovskite solar cells (PSCs) devices.

Abstract

All-inorganic CsPbI3–xBrx perovskite solar cells (PSCs) are advantageous in terms of high thermal stability, while its efficiency lags behind those of organic-inorganic hybrid perovskite counterparts. Defect passivations have been extensively applied for enhancing efficiency of all-inorganic PSCs, which are mainly based on univocal defect passivation of perovskite layer. Herein, we incorporated a bis-dimethylamino-functionalized fullerene derivative (abbreviated as PCBDMAM) as an interlayer between ZnO electron transport layer (ETL) and all-inorganic CsPbI2.25Br0.75 perovskite layer, accomplishing synchronous defect passivations of both layers and consequently dramatic enhancements of efficiency and thermal stability of PSC devices. Upon spin-coating PCBDMAM onto ZnO ETL, the surface defects of ZnO especially oxygen vacancies can be effectively passivated due to the formation of Zn−N ionic bonds. In addition, PCBDMAM incorporation affords effective passivation of PbI and IPb antisite defects within the atop perovskite layer as well via coordination bonding with Pb2+. As a result, the regular-structure planar CsPbI2.25Br0.75 PSC device delivers a champion power conversion efficiency (PCE) of 17.04%, which surpasses that of the control device (15.44%). Moreover, the PCBDMAM-incorporated PSC device maintains ~ 80% of its initial PCE after 600 h heating at 85 °C hot plate in N2 atmosphere, whereas PCE of the control device degrades rapidly to ~ 62% after 460 h heating under identical conditions. Hence, PCBDMAM incorporation benefited dramatic improvement of the thermal stability of PSC device.

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Nano Research Energy
Pages e9120073-e9120073
Cite this article:
Shang Y, Wang P, Jia L, et al. Synchronous defect passivation of all-inorganic perovskite solar cells enabled by fullerene interlayer. Nano Research Energy, 2023, 2: e9120073. https://doi.org/10.26599/NRE.2023.9120073

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Received: 14 February 2023
Revised: 01 April 2023
Accepted: 18 April 2023
Published: 16 May 2023
© The Author(s) 2023. Published by Tsinghua University Press.

The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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