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. 2021 Jan 27;13(3):4203-4210.
doi: 10.1021/acsami.0c20285. Epub 2021 Jan 12.

Band-Gap Tuning in All-Inorganic CsPb x Sn1- xBr3 Perovskites

Heidi A Schwartz  1 , Hannah Laurenzen  1 , Asma Marzouk  2 , Manuel Runkel  3 , Kai Oliver Brinkmann  3 , Detlef Rogalla  4 , Thomas Riedl  3 , Sahel Ashhab  2 , Selina Olthof  1
Affiliations

Band-Gap Tuning in All-Inorganic CsPb x Sn1- xBr3 Perovskites

Heidi A Schwartz et al. ACS Appl Mater Interfaces. .

Abstract

We investigate all-inorganic perovskite CsPbxSn1-xBr3 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 (x = 0) and 2.37 eV (x = 1). Intriguingly, this change is nonlinear in x, with a bowing parameter of 0.9 eV; furthermore, a slight band gap narrowing is found for low Pb content (minimum x ∼ 0.3). The wide tunability of the band gap makes CsPbxSn1-xBr3 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.

Keywords: UPS; XPS; all-inorganic perovskite; band gap; crystal structure; density functional theory; halide perovskite; photoelectron spectroscopy.

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