Title

Comparative Study Of The Zno And Zn 1-X Cd X O Nanorod Emitters Hydrothermally Synthesized And Electrodeposited On P-Gan

Keywords

Electrochemical deposition; Epitaxy; Hydrothermal growth; LED; Photoluminescence; UV-light emitting diode; ZnO Nanorods; ZnO/p-GaN heterojunction

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. © 2012 Elsevier B.V.

Publication Date

10-15-2012

Publication Title

Applied Surface Science

Volume

259

Number of Pages

399-405

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.apsusc.2012.07.058

Socpus ID

84866005652 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84866005652

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