Improving interface quality for 1-cm2 all-perovskite tandem solar cells

Rui He, Wanhai Wang, Zongjin Yi, Felix Lang, Cong Chen (), Jincheng Luo, Jingwei Zhu, Jarla Thiesbrummel, Sahil Shah, Kun Wei, Yi Luo, Changlei Wang, Huagui Lai, Hao Huang, Jie Zhou, Bingsuo Zou, Xinxing Yin, Shengqiang Ren, Xia Hao, Lili Wu, Jingquan Zhang, Jinbao Zhang, Martin Stolterfoht, Fan Fu (), Weihua Tang () and Dewei Zhao ()
Additional contact information
Rui He: Sichuan University
Wanhai Wang: Xiamen University
Zongjin Yi: Sichuan University
Felix Lang: University of Potsdam
Cong Chen: Sichuan University
Jincheng Luo: Sichuan University
Jingwei Zhu: Sichuan University
Jarla Thiesbrummel: University of Potsdam
Sahil Shah: University of Potsdam
Kun Wei: Xiamen University
Yi Luo: Sichuan University
Changlei Wang: Soochow University
Huagui Lai: Empa, Swiss Federal Laboratories for Materials Science and Technology
Hao Huang: Guangxi University
Jie Zhou: Nanjing University of Science and Technology
Bingsuo Zou: Guangxi University
Xinxing Yin: Jiaxing University
Shengqiang Ren: Sichuan University
Xia Hao: Sichuan University
Lili Wu: Sichuan University
Jingquan Zhang: Sichuan University
Jinbao Zhang: Xiamen University
Martin Stolterfoht: University of Potsdam
Fan Fu: Empa, Swiss Federal Laboratories for Materials Science and Technology
Weihua Tang: Xiamen University
Dewei Zhao: Sichuan University

Nature, 2023, vol. 618, issue 7963, 80-86

Abstract: Abstract All-perovskite tandem solar cells provide high power conversion efficiency at a low cost1–4. Rapid efficiency improvement in small-area ( 1.75 eV) perovskite top subcells8, which at present have large voltage and fill factor losses, particularly for large-area (>1 cm2) tandem solar cells. Here we develop a self-assembled monolayer of (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid as a hole-selective layer for wide-bandgap perovskite solar cells, which facilitates subsequent growth of high-quality wide-bandgap perovskite over a large area with suppressed interfacial non-radiative recombination, enabling efficient hole extraction. By integrating (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid in devices, we demonstrate a high open-circuit voltage (VOC) of 1.31 V in a 1.77-eV perovskite solar cell, corresponding to a very low VOC deficit of 0.46 V (with respect to the bandgap). With these wide-bandgap perovskite subcells, we report 27.0% (26.4% certified stabilized) monolithic all-perovskite tandem solar cells with an aperture area of 1.044 cm2. The certified tandem cell shows an outstanding combination of a high VOC of 2.12 V and a fill factor of 82.6%. Our demonstration of the large-area tandem solar cells with high certified efficiency is a key step towards scaling up all-perovskite tandem photovoltaic technology.

Date: 2023
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DOI: 10.1038/s41586-023-05992-y

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