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

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Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double-Perovskite Single Crystals through Alkali-Metal Substitution. / Keshavarz, Masoumeh; Debroye, Elke; Ottesen, Martin et al.

In: Advanced Materials, Vol. 32, No. 40, 2001878, 10.2020.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

Keshavarz, M, Debroye, E, Ottesen, M, Martin, C, Zhang, H, Fron, E, Küchler, R, Steele, JA, Bremholm, M, Van de Vondel, J, Wang, HI, Bonn, M, Roeffaers, MBJ, Wiedmann, S & Hofkens, J 2020, 'Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double-Perovskite Single Crystals through Alkali-Metal Substitution', Advanced Materials, vol. 32, no. 40, 2001878. https://doi.org/10.1002/adma.202001878

APA

Keshavarz, M., Debroye, E., Ottesen, M., Martin, C., Zhang, H., Fron, E., Küchler, R., Steele, J. A., Bremholm, M., Van de Vondel, J., Wang, H. I., Bonn, M., Roeffaers, M. B. J., Wiedmann, S., & Hofkens, J. (2020). Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double-Perovskite Single Crystals through Alkali-Metal Substitution. Advanced Materials, 32(40), [2001878]. https://doi.org/10.1002/adma.202001878

CBE

Keshavarz M, Debroye E, Ottesen M, Martin C, Zhang H, Fron E, Küchler R, Steele JA, Bremholm M, Van de Vondel J, et al. 2020. Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double-Perovskite Single Crystals through Alkali-Metal Substitution. Advanced Materials. 32(40):Article 2001878. https://doi.org/10.1002/adma.202001878

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Bibtex

@article{306e99ed5714431e94e9beb2fadcb1ce,
title = "Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double-Perovskite Single Crystals through Alkali-Metal Substitution",
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.",
keywords = "alkali-substitution, double perovskites, electron–phonon coupling, photophysical properties, X-ray response",
author = "Masoumeh Keshavarz and Elke Debroye and Martin Ottesen and Cristina Martin and Heng Zhang and Eduard Fron and Robert K{\"u}chler and Steele, {Julian A.} and Martin Bremholm and {Van de Vondel}, Joris and Wang, {Hai I.} and Mischa Bonn and Roeffaers, {Maarten B.J.} and Steffen Wiedmann and Johan Hofkens",
year = "2020",
month = oct,
doi = "10.1002/adma.202001878",
language = "English",
volume = "32",
journal = "Advanced Materials",
issn = "0935-9648",
publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
number = "40",

}

RIS

TY - JOUR

T1 - Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double-Perovskite Single Crystals through Alkali-Metal Substitution

AU - Keshavarz, Masoumeh

AU - Debroye, Elke

AU - Ottesen, Martin

AU - Martin, Cristina

AU - Zhang, Heng

AU - Fron, Eduard

AU - Küchler, Robert

AU - Steele, Julian A.

AU - Bremholm, Martin

AU - Van de Vondel, Joris

AU - Wang, Hai I.

AU - Bonn, Mischa

AU - Roeffaers, Maarten B.J.

AU - Wiedmann, Steffen

AU - Hofkens, Johan

PY - 2020/10

Y1 - 2020/10

N2 - 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.

AB - 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.

KW - alkali-substitution

KW - double perovskites

KW - electron–phonon coupling

KW - photophysical properties

KW - X-ray response

UR - http://www.scopus.com/inward/record.url?scp=85089964634&partnerID=8YFLogxK

U2 - 10.1002/adma.202001878

DO - 10.1002/adma.202001878

M3 - Journal article

C2 - 32864757

AN - SCOPUS:85089964634

VL - 32

JO - Advanced Materials

JF - Advanced Materials

SN - 0935-9648

IS - 40

M1 - 2001878

ER -