Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 45, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202202438
Keywords
all-perovskite tandems; flexible tandem solar cells; perovskite; V; (OC)-deficit; wide-bandgap
Categories
Funding
- European Union [850937]
- National Key Research and Development Program of China [2019YFE0120000]
- Fundamental Research Funds for the Central Universities [YJ2021157, YJ201955]
- Engineering Featured Team Fund of Sichuan University [2020SCUNG102]
- HyPerCells (University of Potsdam)
- HyPerCells (Helmholtz-Zentrum Berlin)
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [423749265, 424709669 - SPP 2196, 498155101]
- Federal Ministry for Economic Affairs and Energy [03EE1017C]
- China Scholarship Council (CSC) from the Ministry of Education of P. R. China
- German Federal Ministry for Education and Research (MUJUPO2) [OL 462/4-2]
- National Natural Science Foundation of China [62005188]
- Natural Science Foundation of Jiangsu Province [BK20190825]
- Strategic Focus Area Advanced Manufacturing under the project AMYS-Advancing manufacturability of hybrid organic-inorganic semiconductors for large-area optoelectronics
- Empa internal call 2021 (TexTandem)
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This study addresses the challenges in developing efficient flexible all-perovskite tandem solar cells and presents methods to enhance their efficiency. By using self-assembled monolayers and postdeposition treatment to suppress bulk and interfacial recombination, successful fabrication of flexible all-perovskite tandem solar cells is achieved, leading to high-efficiency performance in the flexible tandems.
Among various types of perovskite-based tandem solar cells (TSCs), all-perovskite TSCs are of particular attractiveness for building- and vehicle-integrated photovoltaics, or space energy areas as they can be fabricated on flexible and lightweight substrates with a very high power-to-weight ratio. However, the efficiency of flexible all-perovskite tandems is lagging far behind their rigid counterparts primarily due to the challenges in developing efficient wide-bandgap (WBG) perovskite solar cells on the flexible substrates as well as their low open-circuit voltage (V-OC). Here, it is reported that the use of self-assembled monolayers as hole-selective contact effectively suppresses the interfacial recombination and allows the subsequent uniform growth of a 1.77 eV WBG perovskite with superior optoelectronic quality. In addition, a postdeposition treatment with 2-thiopheneethylammonium chloride is employed to further suppress the bulk and interfacial recombination, boosting the V-OC of the WBG top cell to 1.29 V. Based on this, the first proof-of-concept four-terminal all-perovskite flexible TSC with a power conversion efficiency of 22.6% is presented. When integrating into two-terminal flexible tandems, 23.8% flexible all-perovskite TSCs with a superior V-OC of 2.1 V is achieved, which is on par with the V-OC reported on the 28% all-perovskite tandems grown on the rigid substrate.
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