发光学报, 2015, 36 (4): 466, 网络出版: 2015-04-14   

Si(111)衬底切偏角对GaN基LED外延膜的影响

Influence of Substrate Miscut on Properties of GaN-based LED Films Grown on Si(111)
作者单位
1 南昌大学 国家硅基LED工程技术研究中心, 江西 南昌 330047
2 南昌大学 材料科学与工程学院, 江西 南昌 330031
摘要
利用金属有机化学气相沉积(MOCVD)方法在具有偏角(0°~0.9°)的Si(111)衬底上生长了GaN薄膜.采用高分辨X射线衍射(HRXRD)对Si衬底的偏角进行了精确的测量,利用HRXRD、原子力显微镜(AFM)以及光致发光(PL)对外延薄膜的晶体质量、量子阱中In组分、表面形貌及光学特性进行了研究.结果表明,Si(111)衬底偏角对量子阱中的In组分、 GaN外延膜的表面形貌、晶体质量以及光学性能具有重大影响.为了获得高质量的GaN外延薄膜,衬底偏角必须控制在小于0.5°的范围内.超出该范围,GaN薄膜的晶体质量、表面形貌及光学性能都明显下降.
Abstract
GaN-based LED films were grown on Si(111) substrate with different miscut angle from 0° to 0.9° by MOCVD.The miscut angles of Si(111) substrates were precisely measured by high resolution X-ray diffraction (HRXRD).The morphologies of the samples were characterized by atomic force microscopy (AFM).The GaN crystal quality and indium content of MQWs were analyzed by HRXRD.The optical properties of the samples were investigated by photoluminescence (PL).The results reveal that the miscut of Si(111) substrate has significant influence on the crystal quality,surface morphology and optical properties of GaN film.The optimal miscut angle of Si(111) substrate is within 0.5°.Beyond this range,the crystal quality,surface morphology and optical properties of GaN film will deteriorate drastically.

武芹, 全知觉, 王立, 刘文, 张建立, 江风益. Si(111)衬底切偏角对GaN基LED外延膜的影响[J]. 发光学报, 2015, 36(4): 466. WU Qin, QUAN Zhi-jue, WANG Li, LIU Wen, ZHANG Jian-li, JIANG Feng-yi. Influence of Substrate Miscut on Properties of GaN-based LED Films Grown on Si(111)[J]. Chinese Journal of Luminescence, 2015, 36(4): 466.

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