Si/ZnO heterostructures for efficient diode and water-splitting applications

Mitta, Sekhar Babu and Murahari, Prashantha and Nandanapalli, Koteeswara Reddy and Mudusu, Devika and Karuppannan, Ramesh and Whang, Dongmok (2018) Si/ZnO heterostructures for efficient diode and water-splitting applications. In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 43 (33). pp. 16015-16023.

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Abstract

We have developed thin zinc oxide (ZnO) layers protected highly conductive p-type silicon (Si) electrodes and investigated their diode and photoanode characteristics. ZnO layers have been deposited on the glass as well as p-Si substrates at a temperature of 400 degrees C by pulsed spray pyrolysis method. The crystal structure, surface morphology, and phase purity of the layers along with electrical characteristics of the heterostructures were investigated. Finally, the photocatalytic water oxidation performance of the ZnO/Si structures was studied in an alkaline electrolyte solution (pH = 10). The as-grown devices exhibited excellent diode characteristics with a turn-on voltage of 4.5 V, and applied bias-voltage dependent carrier transport mechanisms. As compared to bare Si, ZnO coated Si-based PEC devices showed good stability and durability along with very low onset potential of 0.07 V versus Ag/AgCl. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belong to PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords:	Zinc oxide nanolayers; Surface protection layers; Pulsed spray pyrolysis; Diodes; Si/ZnO photoanodes; PEC devices
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics
Date Deposited:	24 Sep 2018 15:37
Last Modified:	24 Sep 2018 15:37
URI:	http://eprints.iisc.ac.in/id/eprint/60702

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