Raman Back-scattering study of Damaged and Strain Subsurface Layers in GaAs Wafers

The damaged and strain subsurface layers of semi insulating(SI) GaAs substrate were characterized non destructively by Raman back scattering.The study shows that the thicknesses of the damaged and strain layers are less than 3μm.The damaged and strain layer can be removed after being etched in H 2SO 4·H 2O 2·H 2O for 1.5 min.

TEM观察砷化镓晶片损伤层

用透射电镜、扫描电镜对ＧａＡｓ材料加工工艺中的表面损伤层进行了观察和检测。结果切片损伤层深度≤５０μｍ、双面研磨损伤层深度≤１５μｍ、机械化学抛光损伤层深度（腐蚀前）＜１．２μｍ。分析了损伤结构及其引入的因素。

碲镉汞薄膜减薄损伤的扫描电镜研究

对由碲镉汞薄膜减薄工艺导致的损伤层的研究至关重要。采用扫描电镜研究了碲镉汞薄膜经减薄工艺后的损伤层,获得了非常有价值的实验结果。结果对由碲镉汞薄膜减薄工艺形成损伤层的认识和后续的工艺优化具有非常重要的指导意义。