Improved Optical Property and Lasing of ZnO Nanowires by Ar Plasma Treatment

Nanoscale Research Letters

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[1] 0000 0004 1789 9163, grid.27446.33, Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV-Emitting Materials and Technology, Northeast Normal University, Ministry of Education, 130024, Changchun, People’s Republic of China;grid.263817.9, Department of Electrical and Electronic Engineering, Southern University of Science and Technology, 518055, Shenzhen, Guangdong, People’s Republic of China;grid.440668.8, State Key Laboratory of High Power Semiconductor Laser, School of Science, Changchun University of Science and Technology, 7089 Wei-Xing Road, 130022, Changchun, People’s Republic of China;grid.440668.8, State Key Laboratory of High Power Semiconductor Laser, School of Science, Changchun University of Science and Technology, 7089 Wei-Xing Road, 130022, Changchun, People’s Republic of China;grid.263817.9, Department of Electrical and Electronic Engineering, Southern University of Science and Technology, 518055, Shenzhen, Guangdong, People’s Republic of China;

关键词: ZnO;    Surface-to-Volume Ratio;    Laser spectroscopy;    Surface modification;    Lasing;   

DOI  :  10.1186/s11671-019-3145-1

来源: publisher

【 摘 要 】

ZnO nanowires play a very important role in optoelectronic devices due to the wide bandgap and high exciton binding energy. However, for one-dimensional nanowire, due to the large surface to volume ratio, surface traps and surface adsorbed species acts as an alternate pathway for the de-excitation of carriers. Ar plasma treatment is a useful method to enhance the optical property of ZnO nanowires. It is necessary to study the optical properties of ZnO nanowires treated by plasma with different energies. Here, we used laser spectroscopy to investigate the plasma treatments with various energies on ZnO nanowires. Significantly improved emission has been observed for low and moderate Ar plasma treatments, which can be ascribed to the surface cleaning effects and increased neutral donor-bound excitons. It is worth mentioning that about 60-folds enhancements of the emission at room temperature can be achieved under 200 W Ar plasma treatment. When the plasma energy exceeds the threshold, high-ion beam energy will cause irreparable damage to the ZnO nanowires. Thanks to the enhanced optical performance, random lasing is observed under optical pumping at room temperature. And the stability has been improved dramatically. By using this simple method, the optical property and stability of ZnO nanowires can be effectively enhanced. These results will play an important role in the development of low dimensional ZnO-based optoelectronic devices.

【 授权许可】

CC BY