【摘要】 使用MBE方法在Si(111)衬底和Si SiO2 Si柔性衬底上生长了GaN外延层 ,并对在两种衬底上生长的样品进行了对比分析 .在柔性衬底上获得了无裂纹的外延层 ,其表面粗糙度为 0 6nm .研究了GaN外延层中的应力及其光学性质 ,光致发光测试结果表明柔性衬底上生长的外延层中应力和杂质浓度明显低于直接生长在Si衬底上的样品的值 .研究结果显示了所用柔性衬底有助于改善GaN外延膜的质量更多还原

【Abstract】 GaN films are deposited on Si and Si-SiO 2-Si compliant substrates by MBE(molecular beam epitaxy) technique and compared optical properties and residual strain with that of the obtained films on the two-kind of substrates.Investigation of the surface morphology shows that crack-free GaN epilayers are obtained on compliant substrates with a value of RMS(root mean square) of 0.6nm.Photoluminescence measurements indicate a great reduce of the residual strain and impurity density in GaN films grown on compliant substrates compared with those on Si substrates.The results show that Si-SiO 2-Si compliant substrates are promising as a substrate for GaN material growth.更多还原