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Defect induced optical bandgap narrowing in undoped SnO2 nanocrystals

Kamble, Vinayak B and Umarji, Arun M (2013) Defect induced optical bandgap narrowing in undoped SnO2 nanocrystals. In: AIP ADVANCES, 3 (8).

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Official URL: http://dx.doi.org/10.1063/1.4819451


Unusual optical bandgap narrowing is observed in undoped SnO2 nanoparticles synthesized by the solution combustion method. The estimated crystallite size is nearly 7 nm. Though the quantum confinement effect predicts a larger optical bandgap for materials with small crystallite size than the bulk, the optical bandgap in the as synthesized materials is found to be 2.9 eV compared to the reported value of 3.6 eV for bulk SnO2 particles. The yellow-green photoluminescence emissions and the observed narrowing of the bandgap can be attributed to the deep donor levels of oxygen vacancies, owing to the high exothermicity of the combustion reaction and the faster cooling rates involved in the process. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

Item Type: Journal Article
Publication: AIP ADVANCES
Additional Information: Copy right for this article belongs to the AMER INST PHYSICS, CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 14 Aug 2015 09:52
Last Modified: 14 Aug 2015 09:52
URI: http://eprints.iisc.ac.in/id/eprint/52134

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