Luminescence with Local Distribution and Its Possible Mechanism in Zinc Oxide Micro-Crystallites

• 来源期刊: 中国物理快报(英文版)
• 年，卷（期）: 2007,（8）
• 页码范围: 2398-2400
• 页数: 3页
• 语种: 英文

摘要

The spatial luminescence distribution in the ZnO microocrystallite films deposited on silicon substrates by CVD at room temperature is investigated by the cathedoluminescence (CL) image. It has been observed that the CL image of the samples constitutes a certain pattern. The UV emission pattern projective to the (0001) face of ZnO grains consists of a series of lines nearby the grain boundaries .The included angles between any two adjacent lines are almost 120°. What is more, some luminescent lines form a close hexagon similar to ZnO crystalline structure. Such a local distribution property shows that the UV emission on as-grown ZnO crystallite should be due to some local defects congregated to {10(1)0} facets of ZnO grain rather than free exciton recombination.