摘要
利用LP-MOCVD技术在Si(111)衬底上,用不同Al组分的AlGaN做缓冲层,再在缓冲层上生长GaN薄膜,采用XRD技术和原子力显微镜(AFM)分析样品知,样品整体的结晶质量良好。通过分析外延层的拉曼谱得出GaN中存在应力,而且是张应力,通过计算得出,应力为0.23 GPa。
Crack-free GaN epitaxial layer is introduced by Low Pressure-Metal-Organic Chemical Vapor Deposition (LP-MOCVD) with step-graded A1GaN buffer layers on Si( 111 ) substrate. The sample has a good crystallization quality analyzed by X-ray diffraction (XRD) and Aomic Force Microscope (AFM). There is tensile stress of 0. 23 GPa in GaN epetaxial layer through Raman spectrum.
出处
《电子科技》
2014年第1期115-116,120,共3页
Electronic Science and Technology