GaAS/Si(100)异质外延4°偏角衬底对外延层结晶质量的提高(英文)  被引量:1

Crystalline quality improvement of GaAs/Si(100) heterostructures by using 4° misoriented substrates

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作  者:熊德平[1,2] 罗莉[1] 雷亮[1] 陈志新[3] 

机构地区:[1]广东工业大学物理与光电工程学院,广州510006 [2]北京邮电大学光通信与光波教育部重点实验室,北京100876 [3]中央财经大学信息学院,北京10081

出  处:《功能材料与器件学报》2010年第3期201-205,共5页Journal of Functional Materials and Devices

基  金:the Natural Science Foundation of China(Grant No.10774031);the Guangdong Provincial Natural Science Foundation(07001790)

摘  要:用低压金属有机物化学汽相沉积法(MOCVD)在Si(100)无偏角和Si(100)4°偏角衬底上外延生长GaAs层。异质外延采用两步生长法,并分别优化了两种衬底上的非晶低温缓冲层的生长条件。用X射线双晶衍射(XRD)和透射电子显微镜(TEM)对两种衬底上的GaAs外延层进行了结构表征,其中Si(100)4°偏角衬底上1.8μm厚GaAs的(004)面XRD衍射半高全宽338 arcsec,同比在无偏角衬底上的半高全宽为494arcsec,TEM图片显示4°偏角衬底上外延层中的位错密度大大降低。GaAs epilayers were grown on exactly (100) -oriented Si and 4° misoriented (100) Si substrates by low - pressure metalorganic chemical vapor deposition ( LP - MOCVD). Two - step method was used to the heteroepitaxial growth and the initial amorphous GaAs buffer layers were optimized, respectively. X -ray diffraction (XRD) and transmission electron microscopy (TEM) were employed to characterize the quality of GaAs epilayers. The full width at half maximum (FWHM) value of XRD (400) ω scan is 340arcsec for 1. 8μm GaAs epilayer on 4° misoriented (100) Si, compared to 494arcsec for 1.8μm GaAs epilayers on exactly (100) -oriented Si. The images of TEM shows the dramatical reduction of dislocations in GaAs epilayers on 4°misoriented (100) Si substrates.

关 键 词:GaAs/Si异质结 X射线衍射(XRD) 透射电子显微镜(TEM) 

分 类 号:TN304.054[电子电信—物理电子学]

 

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