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Optical and Structural Property Tuning in Physical Vapor Deposited Bismuth Halides Cs3Bi2(I1-xBrx)9 (0 ≤ x ≤ 1).

ABSTRACT: Crystalline films of lead-free all-inorganic Cs3Bi2X9 (X = Br, I) perovskites have been deposited by radio frequency (RF)-magnetron sputtering providing high-quality, single-phase films as confirmed by structural, morphological, and optical property characterization. Progressive tuning of crystal structure characteristics and optical absorbance has been achieved in mixed Br/I phases Cs3Bi2(I1-xBrx)9 (0 ≤ x ≤ 1), highlighting a shift of the band gap from about 2.0 eV for Cs3Bi2I9 to 2.64 eV for Cs3Bi2Br9. X-ray diffraction and Raman scattering allowed defining the range of alloyed compositions where single-phase compositions are found. Finally, preliminary photocatalytic activity tests on the degradation of methylene blue provided solid data indicating the future possible exploitation of Bi-based perovskite derivative materials as active photocatalysts.

SUBMITTER: Bonomi S 

PROVIDER: S-EPMC8456412 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature

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Optical and Structural Property Tuning in Physical Vapor Deposited Bismuth Halides Cs<sub>3</sub>Bi<sub>2</sub>(I<sub>1-<i>x</i></sub>Br<sub><i>x</i></sub>)<sub>9</sub> (0 ≤ <i>x</i> ≤ 1).

Bonomi Sara S   Galinetto Pietro P   Patrini Maddalena M   Romani Lidia L   Malavasi Lorenzo L  

Inorganic chemistry 20210902 18

Crystalline films of lead-free all-inorganic Cs<sub>3</sub>Bi<sub>2</sub>X<sub>9</sub> (X = Br, I) perovskites have been deposited by radio frequency (RF)-magnetron sputtering providing high-quality, single-phase films as confirmed by structural, morphological, and optical property characterization. Progressive tuning of crystal structure characteristics and optical absorbance has been achieved in mixed Br/I phases Cs<sub>3</sub>Bi<sub>2</sub>(I<sub>1-<i>x</i></sub>Br<sub><i>x</i></sub>)<sub>9</  ...[more]

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