An EPR investigation on reduced Sn centres in SrSnO3 perovskite

Silva, Adervando, Hurdley, Franciska, de Oliveira, Andre Luiz Menezes, Slater, Thomas ORCID: https://orcid.org/0000-0003-0372-1551, da Silva Maia, Ary, Folli, Andrea ORCID: https://orcid.org/0000-0001-8913-6606 and dos Santos, Ieda Maria Garcia 2024. An EPR investigation on reduced Sn centres in SrSnO3 perovskite. Materials Letters 368 , 136705. 10.1016/j.matlet.2024.136705

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Abstract

The use of the wide band gap SrSnO3 semiconductor in photocatalysis has grown over the last few years, driven predominantly by sustainability given that its constituents are all Earth abundant elements. Using EPR spectroscopy, we elucidate the paramagnetic species present in the material, either intrinsic or photo-generated. EPR measurements confirmed the presence of paramagnetic oxygen vacancies (g = 2.0058) and a defect sensitive to visible light irradiation despite a wide optical band gap of 4.1 eV. This defect was confirmed to be Sn3+ (g = 2.014 and g = 1.994). Its concentration appears to increase with visible light irradiation, suggesting a photo-induced formation associated with electronic transitions from Sn2+ intra-band gap states to the conduction band.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Elsevier
ISSN:	0167-577X
Funders:	Welsh European Funding Office and The Wolfson Foundation
Date of First Compliant Deposit:	14 June 2024
Date of Acceptance:	22 May 2024
Last Modified:	26 Jun 2024 14:33
URI:	https://orca.cardiff.ac.uk/id/eprint/169815

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