Monolithic perovskite/organic tandem solar cells with 23.6% efficiency enabled by reduced voltage losses and optimized interconnecting layer

Wei Chen, Yudong Zhu, Jingwei Xiu, Guocong Chen, Haoming Liang, Shunchang Liu, Hansong Xue, Erik Birgersson, Jian Wei Ho, Xinshun Qin, Jingyang Lin, Ruijie Ma, Tao Liu, Yanling He, Alan Man-Ching Ng, Xugang Guo, Zhubing He (), He Yan, Aleksandra B. Djurišić () and Yi Hou ()
Additional contact information
Wei Chen: The University of Hong Kong
Yudong Zhu: Southern University of Science and Technology
Jingwei Xiu: Southern University of Science and Technology
Guocong Chen: Southern University of Science and Technology
Haoming Liang: National University of Singapore
Shunchang Liu: National University of Singapore
Hansong Xue: National University of Singapore
Erik Birgersson: National University of Singapore
Jian Wei Ho: National University of Singapore
Xinshun Qin: The University of Hong Kong
Jingyang Lin: The University of Hong Kong
Ruijie Ma: The Hong Kong University of Science and Technology, Clear Water Bay
Tao Liu: The Hong Kong University of Science and Technology, Clear Water Bay
Yanling He: The University of Hong Kong
Alan Man-Ching Ng: Southern University of Science and Technology
Xugang Guo: Southern University of Science and Technology
Zhubing He: Southern University of Science and Technology
He Yan: The Hong Kong University of Science and Technology, Clear Water Bay
Aleksandra B. Djurišić: The University of Hong Kong
Yi Hou: National University of Singapore

Nature Energy, 2022, vol. 7, issue 3, 229-237

Abstract: Abstract Due to the large chemical composition and bandgap tunability of both perovskite and organic semiconductors, perovskite/organic tandem solar cells are attractive for next-generation thin-film photovoltaics. However, their efficiency is limited by the open-circuit voltage loss of wide-bandgap perovskite subcells and the non-ideal interconnecting layers. Here we report that the passivation of nickel oxide hole-transporting layers with benzylphosphonic acid leads to the suppression of interfacial recombination, boosting the voltage up to 1.26 V in a 1.79-eV-bandgap perovskite subcell. Then, we develop an optimized interconnecting layer structure based on a 4-nm-thick sputtered indium zinc oxide layer inserted between organic bathocuproine and molybdenum oxide with enhanced electrical properties and transmittance in the near-infrared region. Through these improvements, we achieve a maximum efficiency of 23.60% (22.95% certified) in the perovskite/organic tandem solar cell. In addition, the tandem device retained 90% initial efficiency after 500 h maximum power point tracking under continuous one sun illumination.

Date: 2022
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DOI: 10.1038/s41560-021-00966-8

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