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Spectroscopic studies of In2O3 nanostructures; photovoltaic demonstration of In2O3/p-Si heterojunction

Bhat, Thirumaleshwara N and Roul, Basanta and Rajpalke, Mohana K and Kumar, Mahesh and Krupanidhi, SB (2013) Spectroscopic studies of In2O3 nanostructures; photovoltaic demonstration of In2O3/p-Si heterojunction. In: Journal of Nanoscience and Nanotechnology, 13 (1). pp. 498-503.

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Official URL: http://dx.doi.org/10.1166/jnn.2013.6605


The thermal oxidation process of the indium nitride (InN) nanorods (NRs) was studied. The SEM studies reveal that the cracked and burst mechanism for the formation of indium oxide (In2O3) nanostructures by oxidizing the InN NRs at higher temperatures. XRD results confirm the bcc crystal structure of the as prepared In2O3 nanostructures. Strong and broad photoluminescence spectrum located at the green to red region with maximum intensity at 566 nm along with a weak ultraviolet emission at 338 nm were observed due to oxygen vacancy levels and free excitonic transitions, respectively. The valence band onset energy of 2.1 eV was observed from the XPS valence band spectrum, clearly justifies the alignment of Fermi level to the donor level created due to the presence of oxygen vacancies which were observed in the PL spectrum. The elemental ratio In:O in as prepared In2O3 was found to be 42:58 which is in close agreement with the stoichiometric value of 40:60. A downward shift was observed in the Raman peak positions due to a possible phonon confinement effect in the nanoparticles formed in bursting mechanism. Such single junction devices exhibit promising photovoltaic performance with fill factor and conversion efficiency of 21% and 0.2%, respectively, under concentrated AM1.5 illumination.

Item Type: Journal Article
Publication: Journal of Nanoscience and Nanotechnology
Publisher: American Scientific Publishers
Additional Information: Copyright of this article belongs to American Scientific Publishers.
Keywords: InN; Nanostructures; Thermal Oxidation; In2O3; Photovoltaic Devices
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 10 Jun 2013 07:47
Last Modified: 10 Jun 2013 07:47
URI: http://eprints.iisc.ac.in/id/eprint/46673

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