拉曼光谱
电阻率和电导率
电导率
材料科学
氧气
退火(玻璃)
兴奋剂
分析化学(期刊)
霍尔效应
吸收光谱法
吸收(声学)
凝聚态物理
化学
光电子学
光学
物理化学
电气工程
物理
工程类
复合材料
有机化学
色谱法
作者
Maneesha Narayanan,A. P. Shah,Sandip Ghosh,A. Thamizhavel,Arnab Bhattacharya
摘要
The contribution of oxygen vacancies (VO) to the electrical conductivity of unintentionally doped β-Ga2O3 has been a topic of recent debate. Here, we use a combination of Hall measurements and Raman spectroscopy on as-grown and O2-annealed β-Ga2O3 crystals to investigate the role of VO on electrical conductivity. The annealed samples show a significant decrease in carrier concentration. By comparing the relative Raman shift of individual modes with theoretically calculated contributions of oxygen sites to these modes, we verify the marked reduction of VO in annealed β-Ga2O3 crystals. Furthermore, the IR modes in β-Ga2O3, usually hidden by free carrier absorption, are clearly seen in the annealed sample. The reduction of band tail states as well as free carrier absorption in the annealed samples provides additional evidence for reduced carrier concentration related to VO, making them a key determinant of electrical conductivity in β-Ga2O3.
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