Band-Gap Tuning in All-Inorganic CsPb x Sn 1– x Br 3 Perovskites

We investigate all-inorganic perovskite CsPb Sn Br thin films to determine the variations in the band gap and electronic structure associated with the Pb/Sn ratio. We observe that the band gap can be tuned between 1.86 eV ( = 0) and 2.37 eV ( = 1). Intriguingly, this change is nonlinear in , with a...

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Bibliographic Details
Published inACS applied materials & interfaces Vol. 13; no. 3; pp. 4203 - 4210
Main Authors Schwartz, Heidi A., Laurenzen, Hannah, Marzouk, Asma, Runkel, Manuel, Brinkmann, Kai Oliver, Rogalla, Detlef, Riedl, Thomas, Ashhab, Sahel, Olthof, Selina
Format Journal Article
LanguageEnglish
Published United States 27.01.2021
Subjects
photoelectron spectroscopy
all-inorganic perovskite
density functional theory
crystal structure
UPS
XPS
band gap
halide perovskite
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Summary:We investigate all-inorganic perovskite CsPb Sn Br thin films to determine the variations in the band gap and electronic structure associated with the Pb/Sn ratio. We observe that the band gap can be tuned between 1.86 eV ( = 0) and 2.37 eV ( = 1). Intriguingly, this change is nonlinear in , with a bowing parameter of 0.9 eV; furthermore, a slight band gap narrowing is found for low Pb content (minimum ∼ 0.3). The wide tunability of the band gap makes CsPb Sn Br a promising material, e.g., for a wide-gap subcell in tandem applications or for color-tunable light-emitting diodes. Employing photoelectron spectroscopy, we show that the valence band varies with the Pb/Sn ratio, while the conduction band is barely affected.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.0c20285