Issue 42, 2022

Co-doping of tellurium with bismuth enhances stability and photoluminescence quantum yield of Cs2AgInCl6 double perovskite nanocrystals

Abstract

The co-doping of double perovskites is a useful approach in terms of improving their stability and photoluminescence quantum yield. Herein, Bi3+ and Te4+ cations have been co-doped into Cs2AgInCl6 nanocrystals. Doping with Te4+ cations promotes radiative recombination of self-trapped excitons due to increased defect formation energies of silver and indium vacancies, according to experimental and theoretical results. When used in excess, the TeO2 precursor would generate residual TeO2, Te2O3Cl2, R2TeO, or all three of them, which confined undesired chlorine ions on oxygen vacancies to counteract the pull from the Cs2AgInCl6 host, resulting in improved coordination with surface oleic acid ligands. As a result, 1% Bi and 8% Te co-doped Cs2AgInCl6 nanocrystals reach a high photoluminescence quantum yield of 34% and show an improved stability, maintaining over 70% of their original emission intensity after storage for more than 1 month. These findings are important in the context of producing high-performance properly doped double perovskite nanocrystals for optoelectronic applications.

Graphical abstract: Co-doping of tellurium with bismuth enhances stability and photoluminescence quantum yield of Cs2AgInCl6 double perovskite nanocrystals

Supplementary files

Article information

Article type
Paper
Submitted
29 Agu 2022
Accepted
13 Oki 2022
First published
20 Oki 2022

Nanoscale, 2022,14, 15691-15700

Co-doping of tellurium with bismuth enhances stability and photoluminescence quantum yield of Cs2AgInCl6 double perovskite nanocrystals

S. Wang, R. Shi, B. Tang, Y. Xiong, A. Portniagin, X. Zhao, S. V. Kershaw, R. Long and A. L. Rogach, Nanoscale, 2022, 14, 15691 DOI: 10.1039/D2NR04717A

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