Cs2AgxNa1−xBiyIn1−yCl6 perovskites approaching photoluminescence quantum yields of 100%

Oleksandr Stroyuk; Oleksandra Raievska; Anastasia Barabash; Christian Kupfer; Andres Osvet; Volodymyr Dzhagan; Dietrich R. T. Zahn; Jens Hauch; Christoph J. Brabec

doi:10.1039/D2MA00737A

Cs₂Ag_xNa_1−xBi_yIn_1−yCl₆ perovskites approaching photoluminescence quantum yields of 100%†

Oleksandr Stroyuk,

*^a Oleksandra Raievska,

^a Anastasia Barabash,^b Christian Kupfer,^b Andres Osvet,^b Volodymyr Dzhagan,

^cd Dietrich R. T. Zahn,

^ef Jens Hauch^ab and Christoph J. Brabec^ab

Author affiliations

* Corresponding authors

^a Forschungszentrum Jülich GmbH, Helmholtz-Institut Erlangen Nürnberg für Erneuerbare Energien (HI ERN), 91058 Erlangen, Germany
E-mail: o.stroyuk@fz-juelich.de

^b Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials for Electronics and Energy Technology (i-MEET), Martensstrasse 7, 91058 Erlangen, Germany

^c V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03038 Kyiv, Ukraine

^d Physics Department, Taras Shevchenko National University of Kyiv, 60 Volodymyrs'ka str., 01601 Kyiv, Ukraine

^e Semiconductor Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany

^f Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09107, Chemnitz, Germany

Abstract

A new single-step and green approach for the synthesis of microcrystalline Cs₂Ag_xNa_1−xBi_yIn_1−yCl₆ (CANBIC) perovskites in ambient conditions is introduced. The CANBIC powders emit broadband self-trapped excitonic photoluminescence (PL) with a champion PL quantum yield (QY) of 98 ± 2% and a PL lifetime of ca. 2 μs observed for x = 0.40 and y = 0.01–0.02. The study focuses on the dependence of structural, spectral, and photophysical properties of CANBICs on Bi content. CANBICs are solid solutions with isomorphous In-to-Bi substitution with the bandgap and valence band edge energy decreasing gradually with increasing y. The PL QY and the rate constant of the radiative recombination showed volcano-shaped dependences on the Bi content, while the rate of the non-radiative recombination revealed a drastic growth by three orders of magnitude as the Bi fraction y was elevated from 0.01 to 1.0 indicating that BiCl₆ units are responsible for non-radiative recombination.

This article is part of the themed collection: Celebrating materials science in Germany

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Article information

DOI: https://doi.org/10.1039/D2MA00737A
Article type: Paper
Submitted: 24 Jun 2022
Accepted: 21 Aug 2022
First published: 22 Aug 2022
This article is Open Access

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Mater. Adv., 2022,3, 7894-7903

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Cs₂Ag_xNa_1−xBi_yIn_1−yCl₆ perovskites approaching photoluminescence quantum yields of 100%

O. Stroyuk, O. Raievska, A. Barabash, C. Kupfer, A. Osvet, V. Dzhagan, D. R. T. Zahn, J. Hauch and C. J. Brabec, Mater. Adv., 2022, 3, 7894 DOI: 10.1039/D2MA00737A

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