Annealing effects on the optical and morphological properties of ZnO nanorods on AZO substrate by using aqueous solution method at low temperatureReportar como inadecuado




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Nanoscale Research Letters

, 9:632

2014 International Symposium on Next-Generation Electronics ISNE 2014

Abstract

Vertically aligned ZnO nanorods NRs on aluminum-doped zinc oxide AZO substrates were fabricated by a single-step aqueous solution method at low temperature. In order to optimize optical quality, the effects of annealing on optical and structural properties were investigated by scanning electron microscopy, X-ray diffraction, photoluminescence PL, and Raman spectroscopy. We found that the annealing temperature strongly affects both the near-band-edge NBE and visible defect-related emissions. The best characteristics have been obtained by employing annealing at 400°C in air for 2 h, bringing about a sharp and intense NBE emission. The defect-related recombinations were also suppressed effectively. However, the enhancement decreases with higher annealing temperature and prolonged annealing. PL study indicates that the NBE emission is dominated by radiative recombination associated with hydrogen donors. Thus, the enhancement of NBE is due to the activation of radiative recombinations associated with hydrogen donors. On the other hand, the reduction of visible emission is mainly attributed to the annihilation of OH groups. Our results provide insight to comprehend annealing effects and an effective way to improve optical properties of low-temperature-grown ZnO NRs for future facile device applications.

KeywordsZinc oxide Photoluminescence Raman Annealing Electronic supplementary materialThe online version of this article doi:10.1186-1556-276X-9-632 contains supplementary material, which is available to authorized users.

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Autor: Da-Ren Hang - Sk Emdadul Islam - Krishna Hari Sharma - Shiao-Wei Kuo - Cheng-Zu Zhang - Jun-Jie Wang

Fuente: https://link.springer.com/







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