Journal
SCIENCE CHINA-MATERIALS
Volume 64, Issue 3, Pages 537-546Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-020-1470-5
Keywords
band alignment; NiOx; Sn-Pb mixed perovskite; solar cell
Categories
Funding
- National Key Research and Development Program of China [2016YFA0204000]
- National Natural Science Foundation of China [61935016, U1632118, 21571129]
- ShanghaiTech University, Young 1000 Talents Program, Science Fund for Creative Research Groups [21421004]
- Center for High-resolution Electron Microscopy (ChEM) at ShanghaiTech University [EM02161943]
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Research explores a high-efficiency and stable room-temperatureprocessed HTL for Sn-Pb solar cells, which outperforms high-temperature-annealed films, improves the efficiency of solar cells, and maintains 96% of the original efficiency after 50 days.
Narrow-bandgap tin-lead (Sn-Pb) mixed perovskite solar cells (PSCs) play a key role in constructing perovskite tandem solar cells that are potential to overpass Shockley-Queisser limit. A robust, chemically stable and lowtemperature-processed hole transporting layer (HTL) is essential for building high-efficiency Sn-Pb solar cells and perovskite tandem solar cells. Here, we explore a roomtemperature-processed NiOx (L-NiOx) HTL based on nanocrystals (NCs) for Sn-Pb PSCs. In comparison with hightemperature-annealed NiOx (H-NiOx) film, the L-NiOx film shows deeper valence band and lower trap density, which increases the built-in potential and reduces carrier recombination, leading to a power conversion efficiency of 18.77%, the record for NiOx-based narrow-bandgap PSCs. Furthermore, the device maintains about 96% of its original efficiency after 50 days. This work provides a robust and room-temperatureprocessed HTL for highly efficient and stable narrow-bandgap PSCs.
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