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研制了一套半绝缘半导体光电导率(PC)和光霍尔特性(PH)测试系统。应用该系统测量了多种类型SI-GaAs体单晶室温和77K的光电导特性及典型样品的室温光霍尔特性,对获得的谱线特征从Cr和O能级的角度作了分析讨论。 测试系统使用的光源波长范围是0.6～2μm,对应光子能量约为2.0～0.6eV,在此范围内,通过标定750W卤钨灯的光谱分布和改变灯源热丝电流的办法保证单色光为等
A set of semi-insulating semiconductor photoconductivity (PC) and optical Hall-effect (PH) test systems was developed. The system was used to measure the photoconductivity at room temperature and 77K for various types of single crystals of SI-GaAs and the room temperature optical Hall effect of typical samples. The characteristics of the obtained lines were analyzed and discussed from the perspective of Cr and O levels. The wavelength range of the light source used in the test system is 0.6 ~ 2μm, and the corresponding photon energy is about 2.0 ~ 0.6eV. In this range, the spectral distribution of the 750W halogen lamp and the change of the hot filament current of the lamp source ensure that the monochromatic light is Wait