Universität zu Köln

Schwartz, Heidi A., Laurenzen, Hannah, Marzouk, Asma, Runkel, Manuel, Brinkmann, Kai Oliver ORCID: 0000-0002-2124-3904, Rogalla, Detlef, Riedl, Thomas ORCID: 0000-0003-1084-316X, Ashhab, Sahel and Olthof, Selina ORCID: 0000-0002-8871-1549 (2021). Band-Gap Tuning in All-Inorganic CsPbxSn1-xBr3 Perovskites. ACS Appl. Mater. Interfaces, 13 (3). S. 4203 - 4211. WASHINGTON: AMER CHEMICAL SOC. ISSN 1944-8252

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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 similar to 0.3). The wide tunability of the band gap makes CsPbxSn1-xBrx 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schwartz, Heidi A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Laurenzen, Hannah UNSPECIFIED UNSPECIFIED UNSPECIFIED Marzouk, Asma UNSPECIFIED UNSPECIFIED UNSPECIFIED Runkel, Manuel UNSPECIFIED UNSPECIFIED UNSPECIFIED Brinkmann, Kai Oliver UNSPECIFIED orcid.org/0000-0002-2124-3904 UNSPECIFIED Rogalla, Detlef UNSPECIFIED UNSPECIFIED UNSPECIFIED Riedl, Thomas UNSPECIFIED orcid.org/0000-0003-1084-316X UNSPECIFIED Ashhab, Sahel UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-588925
DOI:	10.1021/acsami.0c20285
Journal or Publication Title:	ACS Appl. Mater. Interfaces
Volume:	13
Number:	3
Page Range:	S. 4203 - 4211
Date:	2021
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1944-8252
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58892