Journal
ADVANCED ENERGY MATERIALS
Volume 10, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201902583
Keywords
all-perovskite tandem solar cells; large grain; low-bandgap perovskites; solar cells; vacuum-assisted growth control
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Funding
- Alexander von Humboldt (Georg Forster Research Fellowship)
- German Federal Ministry for Research and Education (BMBF) through the project PRINTPERO [03SF0557A]
- Helmholtz Association HYIG [VH-NG-1148]
- Science and Technology of Nanostructures (STN), Karlsruhe School of Optics and Photonics (KSOP)
- Deutscher Akademischer Austauschdienst/German academic exchange service (DAAD)
- Deutsche Forschungsgemeinschaft (DFG) [GZ:INST 121384/64-1 FUGG]
- German Federal Ministry for Research and Education (BMBF) through the project PeroSol [03SF0483]
- Helmholtz Energy Materials Foundry (HEMF), PEROSEED [ZT-0024]
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All-perovskite multijunction photovoltaics, combining a wide-bandgap (WBG) perovskite top solar cell (E-G approximate to 1.6-1.8 eV) with a low-bandgap (LBG) perovskite bottom solar cell (E-G < 1.3 eV), promise power conversion efficiencies (PCEs) >33%. While the research on WBG perovskite solar cells has advanced rapidly over the past decade, LBG perovskite solar cells lack PCE as well as stability. In this work, vacuum-assisted growth control (VAGC) of solution-processed LBG perovskite thin films based on mixed Sn-Pb perovskite compositions is reported. The reported perovskite thin films processed by VAGC exhibit large columnar crystals. Compared to the well-established processing of LBG perovskites via antisolvent deposition, the VAGC approach results in a significantly enhanced charge-carrier lifetime. The improved optoelectronic characteristics enable high-performance LBG perovskite solar cells (1.27 eV) with PCEs up to 18.2% as well as very efficient four-terminal all-perovskite tandem solar cells with PCEs up to 23%. Moreover, VAGC leads to promising reproducibility and potential in the fabrication of larger active-area solar cells up to 1 cm(2).
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