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Articolul precedent |
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SM ISO690:2012 LUPAN, Oleg, PAUPORTE, Thierry, CHOW, Lee, CHAI, Guangyu, VIANA, Bruno, URSACHI, Veaceslav, MONAICO, Eduard, TIGINYANU, Ion. Comparative study of the ZnO and Zn 1-xCd xO nanorod emitters hydrothermally synthesized and electrodeposited on p-GaN. In: Applied Surface Science, 2012, vol. 259, pp. 399-405. ISSN 0169-4332. DOI: https://doi.org/10.1016/j.apsusc.2012.07.058 |
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Applied Surface Science | |
Volumul 259 / 2012 / ISSN 0169-4332 | |
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DOI:https://doi.org/10.1016/j.apsusc.2012.07.058 | |
Pag. 399-405 | |
Rezumat | |
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. |
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Cuvinte-cheie electrochemical deposition, Epitaxy, LED, photoluminescence, ZnO Nanorods |
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