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  Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double-Perovskite Single Crystals through Alkali-Metal Substitution

Keshavarz, M., Debroye, E., Ottesen, M., Martin, C., Zhang, H., Fron, E., et al. (2020). Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double-Perovskite Single Crystals through Alkali-Metal Substitution. Advanced Materials, 32(40): 2001878, pp. 1-10. doi:10.1002/adma.202001878.

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 Creators:
Keshavarz, M.1, Author
Debroye, E.1, Author
Ottesen, M.1, Author
Martin, C.1, Author
Zhang, H.1, Author
Fron, E.1, Author
Küchler, Robert2, Author              
Steele, J.A.1, Author
Bremholm, M.1, Author
Van de Vondel, J.1, Author
Wang, H.I.1, Author
Bonn, M.1, Author
Roeffaers, M.B.J.1, Author
Wiedmann, S.1, Author
Hofkens, J.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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Free keywords: alkali-substitution, double perovskites, electron–phonon coupling, photophysical properties, X-ray response
 Abstract: Lead-free double perovskites have great potential as stable and nontoxic optoelectronic materials. Recently, Cs2AgBiBr6 has emerged as a promising material, with suboptimal photon-to-charge carrier conversion efficiency, yet well suited for high-energy photon-detection applications. Here, the optoelectronic and structural properties of pure Cs2AgBiBr6 and alkali-metal-substituted (Cs1−xYx)2AgBiBr6 (Y: Rb+, K+, Na+; x = 0.02) single crystals are investigated. Strikingly, alkali-substitution entails a tunability to the material system in its response to X-rays and structural properties that is most strongly revealed in Rb-substituted compounds whose X-ray sensitivity outperforms other double-perovskite-based devices reported. While the fundamental nature and magnitude of the bandgap remains unchanged, the alkali-substituted materials exhibit a threefold boost in their fundamental carrier recombination lifetime at room temperature. Moreover, an enhanced electron–acoustic phonon scattering is found compared to Cs2AgBiBr6. The study thus paves the way for employing cation substitution to tune the properties of double perovskites toward a new material platform for optoelectronics. © 2020 The Authors. Published by Wiley-VCH GmbH

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Language(s): eng - English
 Dates: 2020-08-312020-08-31
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/adma.202001878
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Title: Advanced Materials
  Other : Adv. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 32 (40) Sequence Number: 2001878 Start / End Page: 1 - 10 Identifier: ISSN: 0935-9648
CoNE: https://pure.mpg.de/cone/journals/resource/954925570855