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Tuning the Optical Absorption of Sn-, Ge-, and Zn-Substituted Cs2AgBiBr6 Double Perovskites: Structural and Electronic Effects
- Source :
- Sebastia-Luna, Paz Calbo Roig, Joaquín Albiach-Sebastián, Nicolás Sessolo, Michele Palazón Huet, Francisco Ortí Guillén, Enrique Bolink, Henk 2021 Tuning the Optical Absorption of Sn-, Ge-, and Zn-Substituted Cs2AgBiBr6 Double Perovskites: Structural and Electronic Effects Chemistry of Materials 33 20 8028 8035, RODERIC. Repositorio Institucional de la Universitat de Valéncia, instname
- Publication Year :
- 2021
- Publisher :
- American Chemical Society (ACS), 2021.
-
Abstract
- Lead-free halide double perovskites (DPs) are highly tunable materials in terms of chemical composition and optical properties. One of the most widely reported DPs is Cs2AgBiBr6, which is envisaged as a promising absorber for photovoltaics. Nevertheless, its bandgap (around 1.9−2.3 eV) remains too large for common tandem solar cells. In this work, we report the mechanochemical synthesis of Sn-, Ge-, and Zn-substituted Cs2AgBiBr6 in powder form; their bandgaps reach 1.55, 1.80, and 2.02 eV, respectively. These differences are rationalized through density functional theory calculations, demonstrating combined electronic and structural (disorder) effects introduced by the divalent metal-cation substituents. Finally, we present the first vacuum-deposited thin films of the Sn-substituted DP, which also show a notable narrowing of the bandgap, and this paves the way toward its implementation in photovoltaic solar cells.
Details
- ISSN :
- 15205002 and 08974756
- Volume :
- 33
- Database :
- OpenAIRE
- Journal :
- Chemistry of Materials
- Accession number :
- edsair.doi.dedup.....9e19fc85418a8e4574d29ccc37aff4b2
- Full Text :
- https://doi.org/10.1021/acs.chemmater.1c02236