Comparative study of the ZnO and Zn1-xCdxO nanorod emitters hydrothermally synthesized and electrodeposited on p-GaN

    Authors

    O. Lupan; T. Pauporte; L. Chow; G. Chai; B. Viana; V. V. Ursaki; E. Monaico;I. M. Tiginyanu

    Comments

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    Abbreviated Journal Title

    Appl. Surf. Sci.

    Keywords

    ZnO Nanorods; Hydrothermal growth; Electrochemical deposition; Epitaxy; Photoluminescence; UV-light emitting diode; LED; ZnO/p-GaN; heterojunction; LIGHT-EMITTING-DIODES; RESONANT RAMAN-SCATTERING; OPTICAL-PROPERTIES; NANOWIRE ARRAYS; GALLIUM NITRIDE; FILMS; PHOTOLUMINESCENCE; GROWTH; ELECTROLUMINESCENCE; HETEROJUNCTION; Chemistry, Physical; Materials Science, Coatings & Films; Physics, ; Applied; Physics, Condensed Matter

    Abstract

    Hydrothermal synthesis and electrodeposition are low-temperature and cost-effective growth techniques of high quality nanostructured active materials for opto-electronic devices. Here we report a hydrothermal seed layer-free and rapid synthesis (15 min) of epitaxial nanorod arrays of ZnO on p-GaN(0 0 0 1). The effects of hydrothermal (HT) versus electrochemical deposition (ECD) synthesis on the optical properties of ZnO nanorods/nanowires on p-GaN substrate are compared in details. For both types of layers, a strong photoluminescent UV-emission was found indicating the high quality of the synthesized ZnO layer. The hetero-structures were used for LED applications. With HT-ZnO and ECD-ZnO, UV-emission started at remarkably low forward voltage of 3.9-4.0 V and 4.4 V respectively and increased rapidly. Moreover, the LED structures showed a stable and repeatable electroluminescence. We propose for further studies a simple, efficient, seed layer-free and low temperature hydrothermal growth technique to fabricate high quality ZnO nanorods/p-GaN heterojunction LED nanodevices. It is also demonstrated that a single short wavelength emission can be shifted to the violet range with Cd-alloying of ZnO used for LED structure. (C) 2012 Elsevier B. V. All rights reserved.

    Journal Title

    Applied Surface Science

    Volume

    259

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    399

    Last Page

    405

    WOS Identifier

    WOS:000310436900064

    ISSN

    0169-4332

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