Role of Ba in engineering band gap, photoluminescence and nonlinear optical properties of SnO2 nanostructures for photovoltaic and photocatalytic applications

Bannur, MS and Antony, Albin and Maddani, KI and Poornesh, P and Manjunatha, KB and Kulkarni, Suresh D and Choudhari, KS (2018) Role of Ba in engineering band gap, photoluminescence and nonlinear optical properties of SnO2 nanostructures for photovoltaic and photocatalytic applications. Superlattices and Microstructures, 122 (1). pp. 156-164. ISSN 0749-6036

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Abstract

In this article, we present the role of Ba doping in tuning energy gap, photoluminescence (PL) and third-order optical nonlinearity χ(3) of SnO2 nanostructures. Surface morphology analysis indicates the fragmentation of larger grains upon Ba incorporation possibly caused by the lattice mismatch effects. X-ray diffraction reveals polycrystalline nature of the nanostructures with rutile tetragonal structure. A shift in preferential growth orientation plane (200, 211, 110) has been observed with increase in Ba concentration. PL spectroscopy studies confirms the crystallinity of the films ruling out the presence of Sn interstitials. The green luminescent center at 550 nm and trap emission at 578 nm are attributed to singly ionized charge state of the oxygen and defect levels in band gap. Relatively large change in the band gap (3.64 eV −3.13 eV) arises due to Ba doping points the credibility of SnO2 thin films for use in photovoltaic and photocatalytic applications. Third-optical nonlinearity of the films investigated by Z-scan technique shows χ(3) as high as 3.37×10−3 esu indicating the suitability of SnO2 nanostructures in nonlinear optical (NLO) devices such as optical power limiters and switches.

Item Type: Article
Uncontrolled Keywords: BaSnO2 nanostructuresNon-linear optical properties (NLO)Photoluminescence (PL)Z-scan
Subjects: Departments at MU > Atomic Molecular Physics
Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 11 Oct 2018 10:35
Last Modified: 11 Oct 2018 10:35
URI: http://eprints.manipal.edu/id/eprint/152127

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