期刊
ADVANCED MATERIALS
卷 34, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202201315
关键词
open-circuit voltage; perovskite; silicon tandem solar cells; phase segregation; strain modulation
类别
资金
- National Natural Science Foundation of China [21975028, 51972004, 22005035]
- National Key Research and Development Program of China [2017YFA0206701, 2020YFB1506400]
- Federal ministry of Economic Affairs and Energy [0324275E]
- TOUCH project [0324351]
- Helmholtz Energy Materials Foundry (HEMF) infrastructure - HGF
- China Postdoctoral Science Foundation [2021M700400]
- Projekt DEAL
This research presents a strain modulation strategy to fabricate light-stable perovskite/silicon tandem solar cells. By converting residual tensile strain to compressive strain, the cells achieve a high power conversion efficiency and improved light stability.
Perovskite/silicon tandem solar cells are promising to penetrate photovoltaic market. However, the wide-bandgap perovskite absorbers used in top-cell often suffer severe phase segregation under illumination, which restricts the operation lifetime of tandem solar cells. Here, a strain modulation strategy to fabricate light-stable perovskite/silicon tandem solar cells is reported. By employing adenosine triphosphate, the residual tensile strain in the wide-bandgap perovskite absorber is successfully converted to compressive strain, which mitigates light-induced ion migration and phase segregation. Based on the wide-bandgap perovskite with compressive strain, single-junction solar cells with the n-i-p layout yield a power conversion efficiency (PCE) of 20.53% with the smallest voltage deficits of 440 mV. These cells also maintain 83.60% of initial PCE after 2500 h operation at the maximum power point. Finally, these top cells are integrated with silicon bottom cells in a monolithic tandem device, which achieves a PCE of 26.95% and improved light stability at open-circuit.
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