Tuning the Structural and Optoelectronic Properties of Cs(2)AgBiBr(6)Double-Perovskite Single Crystals through Alkali-Metal Substitution

Autor: Steffen Wiedmann, Elke Debroye, Joris Van de Vondel, Heng Zhang, Julian A. Steele, Martin Ottesen, Mischa Bonn, Hai I. Wang, Eduard Fron, R. Küchler, Cristina Martin, Johan Hofkens, Maarten B. J. Roeffaers, Martin Bremholm, Masoumeh Keshavarz
Rok vydání: 2020
Předmět:
Technology
X-ray response
Chemistry
Multidisciplinary
02 engineering and technology
LIFETIME
01 natural sciences
Optoelectronic materials
General Materials Science
Chemistry
Physical
Physics
Material system
021001 nanoscience & nanotechnology
Alkali metal
Chemistry
Physics
Condensed Matter
Mechanics of Materials
Physical Sciences
electron–phonon coupling
Optoelectronics
Science & Technology - Other Topics
Double perovskite
double perovskites
0210 nano-technology
Materials science
EFFICIENCY
Band gap
Materials Science
Materials Science
Multidisciplinary
010402 general chemistry
alkali-substitution
Physics
Applied
PHOTOCONDUCTIVITY
Semiconductors and Nanostructures
SEGREGATION
Nanoscience & Nanotechnology
HALIDE DOUBLE PEROVSKITE
photophysical properties
CS2AGBIBR6
Science & Technology
Phonon scattering
business.industry
Mechanical Engineering
Substitution (logic)
Energy conversion efficiency
CARRIER DYNAMICS
TRANSPORT
0104 chemical sciences
PEROVSKITE SOLAR-CELLS
electron-phonon coupling
business
EMISSION
Zdroj: 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 Cs 2 AgBiBr 6 Double-Perovskite Single Crystals through Alkali-Metal Substitution ', Advanced Materials, vol. 32, no. 40, 2001878 . https://doi.org/10.1002/adma.202001878
Advanced Materials, 32, 40, pp. 1-10
Advanced Materials, 32, 1-10
Advanced Materials
ISSN: 0935-9648
Popis: 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.
Databáze: OpenAIRE
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