2D/3D heterojunction engineering at the buried interface towards high-performance inverted methylammonium-free perovskite solar cells

Haiyun Li, Cong Zhang, Cheng Gong, Daliang Zhang, Hong Zhang (), Qixin Zhuang, Xuemeng Yu, Shaokuan Gong, Xihan Chen, Jiabao Yang, Xuanhua Li (), Ru Li, Jingwei Li, Jinfei Zhou, Hua Yang, Qianqian Lin, Junhao Chu, Michael Grätzel (), Jiangzhao Chen () and Zhigang Zang ()
Additional contact information
Haiyun Li: Chongqing University
Cong Zhang: Chongqing University
Cheng Gong: Chongqing University
Daliang Zhang: Chongqing University
Hong Zhang: Fudan University
Qixin Zhuang: Chongqing University
Xuemeng Yu: Southern University of Science and Technology
Shaokuan Gong: Southern University of Science and Technology
Xihan Chen: Southern University of Science and Technology
Jiabao Yang: Northwestern Polytechnical University
Xuanhua Li: Northwestern Polytechnical University
Ru Li: Chongqing University
Jingwei Li: Chongqing University
Jinfei Zhou: Chongqing University
Hua Yang: Chinese Academy of Sciences (CAS)
Qianqian Lin: Wuhan University
Junhao Chu: Fudan University
Michael Grätzel: École Polytechnique Fédérale de Lausanne
Jiangzhao Chen: Chongqing University
Zhigang Zang: Chongqing University

Nature Energy, 2023, vol. 8, issue 9, 946-955

Abstract: Abstract The main bottlenecks limiting the photovoltaic performance and stability of inverted perovskite solar cells (PSCs) are trap-assisted non-radiative recombination losses and photochemical degradation at the interface between perovskite and charge-transport layers. We propose a strategy to manipulate the crystallization of methylammonium-free perovskite by incorporating a small amount of 2-aminoindan hydrochloride into the precursor inks. This additive also modulates carrier recombination and extraction dynamics at the buried interface via the formation of a bottom-up two-dimensional/three-dimensional heterojunction. The resultant inverted PSC achieves a power conversion efficiency of 25.12% (certified 24.6%) at laboratory scale (0.09 cm2) and 22.48% at a larger area (1 cm2) with negligible hysteresis. More importantly, the resulting unencapsulated devices show superior operational stability, maintaining >98% of their initial efficiency of >24% after 1,500 hours of continuous maximum power point tracking under simulated AM1.5 illumination. Meanwhile, the encapsulated devices retain >92% of initial performance for 1,200 hours under the damp-heat test (85 °C and 85% relative humidity).

Date: 2023
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DOI: 10.1038/s41560-023-01295-8

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