利用金属有机物化学金相沉积MOCVD在Si(111)衬底上, 以高温AlN和低温GaN为缓冲层生长的GaN薄膜, 得到GaN(0002)和(10-12)的双晶X射线衍射(DCXRD)半高宽(FWHM)分别为721和840 s.采用高分辨率 DCXRD, 扫描电子显微镜(SEM)分析.结果表明, 以1040 ℃生长的AlN缓冲层能防止Ga与Si反应形成无定形的Si-Ga结构, 是后续生长的"模板".低温的GaN缓冲层可有效减低外延层的缺陷.DCXRD测得的FWHM为0.21, GaN峰强达7 K.
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