Surface structure analysis of ZnO nano-particles fabricated by pulsed Nd: YAG laser ablation under plasma circumstance

摘要

Zinc oxide (ZnO) has extensive potential applications in ultraviolet (UV)/blue light emitting diode, laser, gas sensor, solar cell and transparent thin film transistor, since it has a wide direct-gap of 3.37eV and 60meV binding energy at room temperature.1) Especially ZnO nanostructures exhibiting unique physical, chemical and luminescence properties show great promise for nanoscale photo-electronic devices. Hence, understanding the role of defects and their spatial distribution in ZnO nanoparticles is extremely important in many of these applications. Surface defects have been found to affect the performance for such applications. For example, surface impurities such as hydroxyl are known to quench the UV emission in ZnO, while other surface defects can hinder charge transfer between ZnO and adsorbed molecules at the interface.