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Issue 37, 2014
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Annealing induced solid-state structure dependent performance of ultraviolet photodetectors made from binary oxide-based nanocomposites

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Abstract

In this study, one-dimensional core–shell nanorods of ZnO–TiO2 (ZnO–TiO2 nanorods) were successfully prepared through the atomic layer deposition of amorphous TiO2 ultra-thin films onto ZnO nanorod templates. The subsequent postannealing procedures at 400–800 °C induced core–shell nanorods to transform into high quality crystalline wurtzite ZnO-anatase TiO2 and wurtzite ZnO-cubic Zn2TiO4 (ZnO–ZTO) nanorods. Structural analyses revealed that the surfaces of the ZnO–ZTO nanorods are more irregular and rougher than those of ZnO–TiO2 nanorods. Moreover, ZnO–ZTO nanorods have a higher oxygen vacancy size near the nanostructure surfaces because of a relatively high-temperature solid-state reaction. The surface electron depletion size is associated with the degree of nanorod crystal-imperfection defects, and this might affect the oxide nanorod ultraviolet photoresponse efficiency.

Graphical abstract: Annealing induced solid-state structure dependent performance of ultraviolet photodetectors made from binary oxide-based nanocomposites

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Publication details

The article was received on 11 Feb 2014, accepted on 09 Apr 2014 and first published on 15 Apr 2014


Article type: Paper
DOI: 10.1039/C4RA01205D
Citation: RSC Adv., 2014,4, 19482-19487
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    Annealing induced solid-state structure dependent performance of ultraviolet photodetectors made from binary oxide-based nanocomposites

    Y. Liang and W. Liao, RSC Adv., 2014, 4, 19482
    DOI: 10.1039/C4RA01205D

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