Evolution of native point defects in ZnO bulk probed by positron annihilation spectroscopy

被引：0
作者：
Peng Cheng-Xiao [1 ]
Wang Ke-Fan [1 ]
Zhang Yang [1 ]
Guo Feng-Li [1 ]
Weng Hui-Min [2 ]
Ye Bang-Jiao [2 ]
机构：
[1] Henan Univ, Phys & Elect Sch, Kaifeng 475004, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
来源：
CHINESE PHYSICS B | 2009年 / 18卷 / 05期
关键词：
positron annihilation; ZnO native defects; PHOTOLUMINESCENCE; EMISSIONS; PROGRAM; DONOR;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
This paper studies the evolution of native point defects with temperature in ZnO single crystals by positron lifetime and coincidence Doppler broadening (CDB) spectroscopy, combined with the calculated results of positron lifetime and electron momentum distribution. The calculated and experimental results of the positron lifetime in ZnO bulk ensure the presence of zinc monovacancy, and zinc monovacancy concentration begins to decrease above 600 degrees C annealing treatment. CDB is an effective method to distinguish the elemental species, here we combine this technique with calculated electron momentum distribution to determine the oxygen vacancies, which do not trap positrons due to their positive charge. The CDB spectra show that oxygen vacancies do not appear until 600 degrees C annealing treatment, and increase with the increase of annealing temperature. This study supports the idea that green luminescence has a close relation with oxygen vacancies.
引用
收藏
页码：2072 / 2077
页数：6
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