Issue 12, 2023

Lead halide coordination competition at buried interfaces for low VOC-deficits in wide-bandgap perovskite solar cells

Abstract

Perovskite tandem solar cells (TSCs) have promising prospects to break the efficiency limit of their single-junction solar cells. Wide-bandgap (WBG) perovskite sub cells as an essential component of perovskite TSCs face challenges in achieving high power conversion efficiency due to severe non-radiative charge recombination. Here, we propose an interfacial engineering strategy of sequentially depositing [2-(9H-carbazol-9-yl)ethyl]phosphonic acid and [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid as a hole selective layer, which promotes hole extraction and suppresses the non-radiative recombination at the interface and in the bulk of the perovskite layer. The optimized WBG cells exhibit a remarkable VOC of 1.36 V, resulting in a record low VOC deficit of 0.42 V. Moreover, integrating these WBG perovskite sub cells into all-perovskite tandem cells gives rise to outstanding power conversion efficiencies of 27.34% and 28.05% for two-terminal and four-terminal TSCs, respectively. This research provides a unique perspective for the innovative preparation of highly efficient halide perovskites with high-quality buried interfaces.

Graphical abstract: Lead halide coordination competition at buried interfaces for low VOC-deficits in wide-bandgap perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
25 Aug 2023
Accepted
23 Oct 2023
First published
03 Nov 2023

Energy Environ. Sci., 2023,16, 5992-6002

Lead halide coordination competition at buried interfaces for low VOC-deficits in wide-bandgap perovskite solar cells

H. Cui, L. Huang, S. Zhou, C. Wang, X. Hu, H. Guan, S. Wang, W. Shao, D. Pu, K. Dong, J. Zhou, P. Jia, W. Wang, C. Tao, W. Ke and G. Fang, Energy Environ. Sci., 2023, 16, 5992 DOI: 10.1039/D3EE02818F

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