Band-Gap Tuning in All-Inorganic CsPb_{x}Sn_{1–x}Br₃ Perovskites

Heidi A. Schwartz; Hannah Laurenzen; Asma Marzouk; Manuel Runkel; Kai Oliver Brinkmann; Detlef Rogalla; Thomas Riedl; Sahel Ashhab; Selina Olthof

doi:10.1021/acsami.0c20285

journal article·2021-01-27

Band-Gap Tuning in All-Inorganic CsPb_xSn_1–xBr₃ Perovskites

Heidi A. Schwartz, Hannah Laurenzen, Asma Marzouk, Manuel Runkel, Kai Oliver Brinkmann, Detlef Rogalla, Thomas Riedl, Sahel Ashhab, Selina Olthof

ACS Applied Materials & Interfaces· Volume 13· Issue 3

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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.

Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Thermal Expansion and Ionic Conductivity · Solid-state spectroscopy and crystallography

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, University of Cologne, Greinstrasse 4-6, 50939 Cologne, Germany

Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, P.O. Box 34110, Doha 122104, Qatar

Institute of Electronic Devices and Wuppertal Center for Smart Materials & Systems, University of Wuppertal, Rainer-Gruenter-Str. 21, 42119 Wuppertal, Germany

RUBION, University of Bochum, Universitätsstr. 150, 44801 Bochum, Germany

Funding

Deutsche Forschungsgemeinschaft · Qatar National Research Fund

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