Citation: Lijie Zhu, Qipeng Lu, Chunhai Li, Yue Wang, Zhenbo Deng. Graded interface engineering of 3D/2D halide perovskite solar cells through ultrathin (PEA)₂PbI₄ nanosheets[J]. Chinese Chemical Letters, ;2021, 32(7): 2259-2262. doi: 10.1016/j.cclet.2020.12.052 shu

Graded interface engineering of 3D/2D halide perovskite solar cells through ultrathin (PEA)₂PbI₄ nanosheets

Lijie Zhu ^{a, b} ,
Qipeng Lu ^c ,
Chunhai Li ^{a, b} ,
Yue Wang ^a ,
Zhenbo Deng ^{a, *,}

a.
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing JiaoTong University, Beijing 100044, China
b.
School of Instrument Science and Opto-Electronics Engineering, Beijing Information Science and Technology University, Beijing 100192, China
c.
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

zbdeng@bjtu.edu.cn

Received Date: 21 October 2020
Revised Date: 23 November 2020
Accepted Date: 23 November 2020
Available Online: 5 January 2021

Figures(4)

2D halide perovskites have emerged as promising materials because of their stability and passivation effect in perovskite solar cells (PSCs). However, the introduction of bulky organic ammonium cations from 2D halide perovskites would decrease the device performance generally compared to the traditional 3D MAPbI₃. Incorporation of ultrathin 2D halide perovskite nanosheets (NSs) with 3D MAPbI₃ could address this issue. Herein, we report a rationally designed PSCs with dimensional graded 3D/2D MAPbI₃/(PEA)₂PbI₄ heterojunction, in which 2D (PEA)₂PbI₄ NSs were synthesized and incorporated between 3D MAPbI₃ and hole-transporting layer. Besides the significantly improved stability, a notable increasement in power conversion efficiency (PCE) of 20% was obtained for the 3D/2D perovskite solar cells due to the favourable band alignment among (PEA)₂PbI₄ NSs and the other components. The graded structure of MAPbI₃/(PEA)₂PbI₄ would upshift the energy level continuously, which enhances the hole extraction efficiency thus reduces the interface charge recombination, leading to the increasements of V_OC from 1.04 V to 1.07 V, J_SC from 21.81 mA/cm² to 23.15 mA/cm² and the fill factor from 67.89% to 74.78%, and therefore an overall PCE of 18.53%.
- Interface engineering,
- Perovskite solar cell,
- Two-dimensional perovskite,
- Hole extraction layer,
- Band alignment
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沈阳化工大学材料科学与工程学院沈阳 110142

Graded interface engineering of 3D/2D halide perovskite solar cells through ultrathin (PEA)2PbI4 nanosheets

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通讯作者: 陈斌, bchen63@163.com

Graded interface engineering of 3D/2D halide perovskite solar cells through ultrathin (PEA)₂PbI₄ nanosheets