期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 46, 页码 24608-24619出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta07005j
关键词
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资金
- KIT-Publication Fund of the Karlsruhe Institute of Technology
- DAAD (Deutscher Akademischer Austauschdienst/German academic exchange service) [91621525]
- Alexander von Humboldt (Georg Forster Research Fellowship)
- German Federal Ministry of Education and Research (BMBF) through PRINTPERO [03SF0557A]
- German Federal Ministry for Economic Affairs and Energy (CAPITANO) [03EE1038B]
- Initiating and Networking funding of Helmholtz Association HYIG of U.W.P. [VH-NG-1148]
- Helmholtz Energy Materials Foundry (HEMF)
- Science and Technology of Nanostructures (STN)
- Karlsruhe School of Optics & Photonics (KSOP)
- Australian Centre for Advanced Photovoltaics (ACAP)
- PEROSEED [ZT-0024]
All-perovskite multi-junction photovoltaics, comprised of a wide-bandgap (WBG) and a low-bandgap (LBG) perovskite solar cell (PSC), has opened a new window to cost-effective yet highly efficient solar cells (>33%). However, the poor operational stability of LBG PSCs is a major obstacle to the technological advance of all-perovskite tandem solar cells (all-PTSC). This study demonstrates that introducing minute quantities of Cs (1-10%) into the LBG FA(0.8)MA(0.2)Sn(0.5)Pb(0.5)I(3) perovskite semiconductors (E-g = 1.26 eV) significantly improves the operational photo-stability of the corresponding LBG PSCs, due to a reduction of residual nanosized SnyPb(1-y)I2 aggregates, resulting in a beneficial stoichiometric composition. For an optimal concentration of Cs (2.5%) in the investigated range, the LBG PSCs attain remarkable power conversion efficiency (PCE) as high as 18.2% and maintain up to 92% of their initial power output after two hours under simulated one sun illumination. By mechanically stacking high-performance LBG bottom PSCs with semi-transparent top PSCs (E-g = 1.65 eV), four-terminal all-PTSCs with high PCE of 23.6% are attainable.
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