Journal
ADVANCED MATERIALS
Volume 32, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202000449
Keywords
CsPbI(3)quantum dots; di-n-propylamine; perovskite solar cells; surface ligand engineering
Categories
Funding
- National Key Research Projects [2016YFA0202402]
- National Natural Science Foundation of China [51761145013, 61911530158, 51803144, 61674111]
- Natural Science Foundation of Jiangsu Province of China [BK20170337]
- China Postdoctoral Science Foundation [2019M651942]
- 111 projects
- National Renewable Energy Laboratory
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- Office of Science, Office of Basic Energy Sciences within the U.S. Department of Energy
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Lead-halide perovskite quantum dots (PQDs) or more broadly, nanocrystals possess advantageous features for solution-processed photovoltaic devices. The nanocrystal surface ligands play a crucial role in the transport of photogenerated carriers and ultimately affect the overall performance of PQD solar cells. Significantly improved CsPbI(3)PQD synthetic yield and solar-cell performance through surface ligand management are demonstrated. The treatment of a secondary amine, di-n-propylamine (DPA), provides a mild and efficient approach to control the surface ligand density of PQDs, which has an apparently different working mechanism compared to previously reported surface treatments. Using an optimal DPA concentration, the treatment can simultaneously remove both long-chain insulating surface ligands of oleic acid and oleylamine, even for unpurified PQDs with high ligand density. As a result, the electrical coupling between PQDs is enhanced, leading to improved charge transport, reduced carrier recombination, and a high power conversion efficiency approaching 15% for CsPbI3-PQD-based solar cells. In addition, the production yield of CsPbI(3)PQDs can be increased by a factor of 8. These results highlight the importance of developing new ligand-management strategies, specifically for emerging PQDs to achieve scalable and high-performance perovskite-based optoelectronic devices.
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