The Making and Breaking of Lead-Free Double Perovskite Nanocrystals of Cesium Silver–Bismuth Halide Compositions
Abstract
Replacing lead in halide perovskites is of great interest due to concerns about stability and toxicity. Recently, lead free double perovskites in which the unit cell is doubled and two divalent lead cations are substituted by a combination of mono- and trivalent cations have been synthesized as bulk single crystals and as thin films. In this report, we investigate stability and optical properties of all-inorganic cesium silver(I) bismuth(III) chloride and bromide nanocrystals with the double perovskite crystal structure. The cube-shaped nanocrystals are monodisperse in size with typical side lengths of 8 to 15 nm. The absorption spectrum of the nanocrystals presents a sharp peak, which we assign to a direct bismuth s-p transition and not to a quantum confined excitonic transition. Using this spectroscopic handle combined with high-resolution transmission electron microscopy (TEM) based elemental analysis, we conduct stoichiometric studies at the single nanocrystal level as well as decomposition assays in solution and observe that Ag+ diffusion and coalescence is one of the pathways by which this material degrades. Drying the nanocrystals leads to self-assembly into ordered nanocrystal solids, and these exhibit less degradation than nanocrystals in solution. Our results show that Cs2AgBiX6 (X = Cl, Br) nanocrystals are a usefulmore »
- Authors:
-
[1];
[1];
[1];
[1]
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; China Scholarship Council; National Science Foundation (NSF)
- OSTI Identifier:
- 1532323
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 18; Journal Issue: 6; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Lead-free halide perovskites; double perovskites; cesium silver bismuth halides; perovskite nanocrystals
Citation Formats
Bekenstein, Yehonadav, Dahl, Jakob C., Huang, Jianmei, Osowiecki, Wojciech T., Swabeck, Joseph K., Chan, Emory M., Yang, Peidong, and Alivisatos, A. Paul. The Making and Breaking of Lead-Free Double Perovskite Nanocrystals of Cesium Silver–Bismuth Halide Compositions. United States: N. p., 2018.
Web. doi:10.1021/acs.nanolett.8b00560.
Bekenstein, Yehonadav, Dahl, Jakob C., Huang, Jianmei, Osowiecki, Wojciech T., Swabeck, Joseph K., Chan, Emory M., Yang, Peidong, & Alivisatos, A. Paul. The Making and Breaking of Lead-Free Double Perovskite Nanocrystals of Cesium Silver–Bismuth Halide Compositions. United States. https://doi.org/10.1021/acs.nanolett.8b00560
Bekenstein, Yehonadav, Dahl, Jakob C., Huang, Jianmei, Osowiecki, Wojciech T., Swabeck, Joseph K., Chan, Emory M., Yang, Peidong, and Alivisatos, A. Paul. Wed .
"The Making and Breaking of Lead-Free Double Perovskite Nanocrystals of Cesium Silver–Bismuth Halide Compositions". United States. https://doi.org/10.1021/acs.nanolett.8b00560. https://www.osti.gov/servlets/purl/1532323.
@article{osti_1532323,
title = {The Making and Breaking of Lead-Free Double Perovskite Nanocrystals of Cesium Silver–Bismuth Halide Compositions},
author = {Bekenstein, Yehonadav and Dahl, Jakob C. and Huang, Jianmei and Osowiecki, Wojciech T. and Swabeck, Joseph K. and Chan, Emory M. and Yang, Peidong and Alivisatos, A. Paul},
abstractNote = {Replacing lead in halide perovskites is of great interest due to concerns about stability and toxicity. Recently, lead free double perovskites in which the unit cell is doubled and two divalent lead cations are substituted by a combination of mono- and trivalent cations have been synthesized as bulk single crystals and as thin films. In this report, we investigate stability and optical properties of all-inorganic cesium silver(I) bismuth(III) chloride and bromide nanocrystals with the double perovskite crystal structure. The cube-shaped nanocrystals are monodisperse in size with typical side lengths of 8 to 15 nm. The absorption spectrum of the nanocrystals presents a sharp peak, which we assign to a direct bismuth s-p transition and not to a quantum confined excitonic transition. Using this spectroscopic handle combined with high-resolution transmission electron microscopy (TEM) based elemental analysis, we conduct stoichiometric studies at the single nanocrystal level as well as decomposition assays in solution and observe that Ag+ diffusion and coalescence is one of the pathways by which this material degrades. Drying the nanocrystals leads to self-assembly into ordered nanocrystal solids, and these exhibit less degradation than nanocrystals in solution. Our results show that Cs2AgBiX6 (X = Cl, Br) nanocrystals are a useful model system to study structure-function relationships in the search for stable nontoxic halide perovskites.},
doi = {10.1021/acs.nanolett.8b00560},
journal = {Nano Letters},
number = 6,
volume = 18,
place = {United States},
year = {2018},
month = {5}
}
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