【摘要】 <正>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更多还原

【Abstract】 A equipment for the measurements of photo-conductivity and photo-Hall effect, which provides a useful tool to investigate the influences of deep level impurities on the properties of semi-insulating materials, has been developed. The results at RT and 77 K by using this equipment on several different types of SI-GaAg crystals are reported. We also discuss some features of spectra obtained from these measurements. in view of the existence of Cr and O levels in crystals.更多还原