中国激光, 2018, 45 (10): 1003002, 网络出版: 2018-10-12
ZnO纳米线表面改性及其光学性质 下载: 957次
Surface Modification and Optical Properties of ZnO Nanowires
材料 光致发光增强 Ar+等离子体处理 ZnO纳米线 表面态 materials photoluminescence enhancement Ar+ plasma treatment ZnO nanowires surface states
摘要
利用Ar+等离子体处理ZnO纳米线, 通过对不同处理时间后的样品进行变温光谱测试, 分析了处理前后ZnO发光性质的变化。结果表明:随着处理时间的增加, 其室温带边发光强度先增加后减小, 处理90 s时是原生样品的2.45倍, 位于可见区的缺陷发光得到了抑制。通过10 K下发光谱的对比, 分析了等离子体作用的机理。当处理时间较短时, Ar+等离子体可以有效除去ZnO纳米线表面的杂质和缺陷, 提高其紫外发光强度; 而处理时间较长时, 将引入更多的深施主态缺陷, 破坏其晶体结构, 从而降低其发光性能。
Abstract
The ZnO nanowires are treated by the Ar+ plasma and the changes of luminescence properties before and after treatments are analyzed by the test of temperature-dependent spectra under different treatment time. The results show that the near band edge emission intensity at room temperature increases first and then decreases with the increase of treatment time. As for the treatment time of 90 s, the intensity is 2.45 times that of the as-grown sample and simultaneously the defect-related photo-luminescence in visible region is suppressed. The mechanism of plasma treatment is analyzed by the comparison among luminescence spectra at 10 K. When the treatment time is short, the impurities and defects on the ZnO nanowire surfaces can be effectively removed by the Ar+ plasma and thus ultraviolet luminescence intensity is enhanced. When the treatment time is relatively long, the crystal structure is broken due to the introduction of more deep donor-state defects and thus the luminescence property is reduced.
胡颖, 李浩林, 王登魁, 贾慧民, 魏志鹏, 王晓华, 方铉, 房丹, 王新伟. ZnO纳米线表面改性及其光学性质[J]. 中国激光, 2018, 45(10): 1003002. Hu Ying, Li Haolin, Wang Dengkui, Jia Huimin, Wei Zhipeng, Wang Xiaohua, Fang Xuan, Fang Dan, Wang Xinwei. Surface Modification and Optical Properties of ZnO Nanowires[J]. Chinese Journal of Lasers, 2018, 45(10): 1003002.