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

Dai, Xuezeng; Chen, Shangshang; Jiao, Haoyang; Zhao, Liang; Wang, Ke; Ni, Zhenyi; Yu, Zhenhua; Chen, Bo; Gao, Yongli; Huang, Jinsong

doi:10.1038/s41560-022-01102-w

DOE OSTI · 1884292

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

Dai, Xuezeng·Chen, Shangshang·Jiao, Haoyang·Zhao, Liang·Wang, Ke·Ni, Zhenyi·Yu, Zhenhua·Chen, Bo·Gao, Yongli·Huang, Jinsong

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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 SnO 2 layer on the NBG film surface. Monolithic all-perovskite tandem solar modules showed a champion efficiency of 21.6% with a 14.3 cm 2 aperture area, corresponding to an active area efficiency of 23.0%. Lastly, the very small cell-to-module derate of 6.5% demonstrates the advantage of a tandem monolithic structure for solar modules.

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Dai, Xuezeng, Chen, Shangshang, Jiao, Haoyang, Zhao, Liang, Wang, Ke, Ni, Zhenyi, Yu, Zhenhua, Chen, Bo, Gao, Yongli, Huang, Jinsong. 2022-08-29. Efficient monolithic all-perovskite tandem solar modules with small cell-to-module derate. https://doi.org/10.1038/s41560-022-01102-w

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