Lead-Free SmaII-Bandgap Cs2CuSbCl6 Double Perovskite Nanocrystals
- 6 August 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 11 (15), 6463-6467
- https://doi.org/10.1021/acs.jpclett.0c01968
Abstract
Lead-free halide double perovskites (DPs) have attracted great attention due to their stability, nontoxicity and good photophysical property. In this work, we report a new, small-bandgap Cs2CuSbCl6 DP nanocrystals (NCs) with a bandgap of 1.66 eV, which is the smallest bandgap in reported lead-free three-dimensional DP NCs. Density functional theory calculations confirm that Cs2CuSbCl6 DP has an indirect bandgap of 1.70 eV, in good agreement with the experimental result. The photophysical property of Cs2CuSbCl6 NCs is studied by the combination of femtosecond transient absorption (TA) and nanosecond TA techniques. In addition, the Cs2CuSbCl6 NCs exhibit good stability exposed in the air. These results show that these NCs will have great potential to be used as a light-absorbing material for photovoltaic applications.Funding Information
- Ministry of Science and Technology of the People's Republic of China (2017YFA0204800)
- Natural Science Foundation of Jiangsu Province (BK20170032)
- National Natural Science Foundation of China (11974185, 21525315, 21533010, 21833009)
- Chinese Academy of Sciences (YJKYYQ20190003)
- Liaoning Province (XLYC1802126)
- Dalian City Foundation for Science and Technology Innovation (2019J12GX031)
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