期刊
ADVANCED MATERIALS
卷 31, 期 33, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201900593
关键词
cation exchange; quantum dots; solar cells; solution-phase ligand exchange
类别
资金
- China Postdoctoral Science Foundation [2017M622416] Funding Source: Medline
- China Postdoctoral Science Foundation Funded Project [2017M622416] Funding Source: Medline
- Fundamental Research Funds for the Central Universities [2017KFXKJC0020] Funding Source: Medline
- Major State Basic Research Development Program of China [2016YFA0204000] Funding Source: Medline
- National Natural Science Foundation of China [51602114, 61725401, 61804061] Funding Source: Medline
Low-cost solution-processed lead chalcogenide colloidal quantum dots (CQDs) have garnered great attention in photovoltaic (PV) applications. In particular, lead selenide (PbSe) CQDs are regarded as attractive active absorbers in solar cells due to their high multiple-exciton generation and large exciton Bohr radius. However, their low air stability and occurrence of traps/defects during film formation restrict their further development. Air-stable PbSe CQDs are first synthesized through a cation exchange technique, followed by a solution-phase ligand exchange approach, and finally absorber films are prepared using a one-step spin-coating method. The best PV device fabricated using PbSe CQD inks exhibits a reproducible power conversion efficiency of 10.68%, 16% higher than the previous efficiency record (9.2%). Moreover, the device displays remarkably 40-day storage and 8 h illuminating stability. This novel strategy could provide an alternative route toward the use of PbSe CQDs in low-cost and high-performance infrared optoelectronic devices, such as infrared photodetectors and multijunction solar cells.
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