کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5361478 | 1503704 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Comparative study of the ZnO and Zn1âxCdxO nanorod emitters hydrothermally synthesized and electrodeposited on p-GaN Comparative study of the ZnO and Zn1âxCdxO nanorod emitters hydrothermally synthesized and electrodeposited on p-GaN](/preview/png/5361478.png)
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 (15Â min) of epitaxial nanorod arrays of ZnO on p-GaN(0Â 0Â 0Â 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 3.9-4.0Â V and 4.4Â 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.
Highlights⺠Rapid hydrothermal seed layer-free synthesis (15 min) of epitaxial ZnO and n-Zn1âxCdxO nanorod arrays on p-GaN(0 0 0 1). ⺠The effects of hydrothermal versus electrochemical deposition synthesis on the optical properties of ZnO nanorods on GaN substrate are reported in details. ⺠The hetero-structures were used for LED applications. With hydrothermal-ZnO and electrodeposited-ZnO, UV-emission started at low forward voltage of 3.9-4.0 V and 4.4 V. ⺠It was demonstrated that a single short wavelength emission shifted to the violet range with Cd-alloying of ZnO nanorods by hydrothermal technique.
Journal: Applied Surface Science - Volume 259, 15 October 2012, Pages 399-405