Efficient monolithic all-perovskite tandem solar modules with small cell-to-module derate

Xuezeng Dai, Shangshang Chen, Haoyang Jiao, Liang Zhao, Ke Wang, Zhenyi Ni, Zhenhua Yu, Bo Chen, Yongli Gao and Jinsong Huang ()
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Xuezeng Dai: University of North Carolina at Chapel Hill
Shangshang Chen: University of North Carolina at Chapel Hill
Haoyang Jiao: University of North Carolina at Chapel Hill
Liang Zhao: University of North Carolina at Chapel Hill
Ke Wang: University of Rochester
Zhenyi Ni: University of North Carolina at Chapel Hill
Zhenhua Yu: University of North Carolina at Chapel Hill
Bo Chen: University of North Carolina at Chapel Hill
Yongli Gao: University of Rochester
Jinsong Huang: University of North Carolina at Chapel Hill

Nature Energy, 2022, vol. 7, issue 10, 923-931

Abstract: Abstract All-perovskite tandem solar modules are promising to reduce the cost of photovoltaic systems with their high efficiency and solution fabrication, but their sensitivity to air still imposes a great challenge. Here a hot gas-assisted blading method is developed to accelerate the perovskite solidification, forming compact and thick narrow bandgap (NBG) perovskite films. Adding a reduction agent into NBG films followed by a short period of air exposure and a post-fabrication storage surprisingly increases carrier recombination lifetime and enables laser scribing in ambient conditions without obvious loss of device performance. This combination suppresses tin and iodide oxidation and forms a thin SnO2 layer on the NBG film surface. Monolithic all-perovskite tandem solar modules showed a champion efficiency of 21.6% with a 14.3 cm2 aperture area, corresponding to an active area efficiency of 23.0%. The very small cell-to-module derate of 6.5% demonstrates the advantage of a tandem monolithic structure for solar modules.

Date: 2022
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DOI: 10.1038/s41560-022-01102-w

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