Efficient two-terminal all-perovskite tandem solar cells enabled by high-quality low-bandgap absorber layers

Dewei Zhao (), Cong Chen, Changlei Wang, Maxwell M. Junda, Zhaoning Song, Corey R. Grice, Yue Yu, Chongwen Li, Biwas Subedi, Nikolas J. Podraza, Xingzhong Zhao, Guojia Fang, Ren-Gen Xiong, Kai Zhu and Yanfa Yan ()
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Dewei Zhao: The University of Toledo
Cong Chen: The University of Toledo
Changlei Wang: The University of Toledo
Maxwell M. Junda: The University of Toledo
Zhaoning Song: The University of Toledo
Corey R. Grice: The University of Toledo
Yue Yu: The University of Toledo
Chongwen Li: The University of Toledo
Biwas Subedi: The University of Toledo
Nikolas J. Podraza: The University of Toledo
Xingzhong Zhao: Wuhan University
Guojia Fang: Wuhan University
Ren-Gen Xiong: Nanchang University
Kai Zhu: National Renewable Energy Laboratory
Yanfa Yan: The University of Toledo

Nature Energy, 2018, vol. 3, issue 12, 1093-1100

Abstract: Abstract Multi-junction all-perovskite tandem solar cells are a promising choice for next-generation solar cells with high efficiency and low fabrication cost. However, the lack of high-quality low-bandgap perovskite absorber layers seriously hampers the development of efficient and stable two-terminal monolithic all-perovskite tandem solar cells. Here, we report a bulk-passivation strategy via incorporation of chlorine, to enlarge grains and reduce electronic disorder in mixed tin–lead low-bandgap (~1.25 eV) perovskite absorber layers. This enables the fabrication of efficient low-bandgap perovskite solar cells using thick absorber layers (~750 nm), which is a requisite for efficient tandem solar cells. Such improvement enables the fabrication of two-terminal all-perovskite tandem solar cells with a champion power conversion efficiency of 21% and steady-state efficiency of 20.7%. The efficiency is retained to 85% of its initial performance after 80 h of operation under continuous illumination.

Date: 2018
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DOI: 10.1038/s41560-018-0278-x

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