期刊
JOURNAL OF CHEMICAL PHYSICS
卷 151, 期 19, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.5127887
关键词
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资金
- Ministry of Science and Technology of China [2018YFA0208703]
- China Postdoctoral Science Foundation [2019M651155]
Lead halide perovskite nanocrystals (NCs) have emerged as enabling materials for optoelectronics and photonics. A parameter essential for these applications is the photoluminescence quantum yield (PL QY) of these NCs. Despite being generally conceived as defect-tolerant, perovskite NCs often have PL QYs significantly lower than unity, particularly for CsPbCl3 NCs with QYs typically lower than 10%. Postsynthetic treatments by (pseudo)halide salts were found to effectively improve the PL QYs, but the exact role played by the treatments (i.e., passivating electron and/or hole trapping sites) remains unclear. Here, we performed a side-by-side comparison between as-prepared and treated CsPbCl3 NCs using transient absorption and time-resolved PL measurements of sub-ps time resolution. We clearly identify ps electron trapping as the dominant channel impairing the PL QYs of as-prepared CsPbCl3 NCs. Electron trapping is effectively alleviated in the halide salt treated NCs. These insights should allow for rational improvement of the emissivity of perovskite NCs for the above-mentioned applications. Published under license by AIP Publishing.
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