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同步辐射背反射白光形貌术观察6H-SiC单晶中的小角晶界和微管
Observation of low angle grain boundaries and micropipes in 6H-SiC single crystal by synchrotron radiation black reflection white-beam topography
【摘要】 利用同步辐射X射线形貌术对升华法生长的6H-SiC(0001)晶片中的小角晶界与微管缺陷进行了研究。小角晶界在同步辐射中的形貌成直线沿〈11-00〉方向分布。根据螺位错附近的应变场和衍射几何,模拟了基本Burgers矢量大小的螺位错在同步辐射形貌像中的衍衬像,模拟结果与实验结果符合较好。据此指认了基本螺位错,并确定了微管Burgers矢量的大小。
【Abstract】 Low angle grain boundaries and micropipes in 6H-SiC wafer were observed by synchrotron radiation back refection white-beam topography.Low angle grain boundaries are polygonized into 〈11- 00〉 directions.Based on the strain field around the screw dislocation and the diffraction geometry,we simulated the topograph of unit c screw dislocation.The calculated values were in good agreement with the experimental observation.The micropipes with different Burgers vectors in topograph were distinguished by this method.
【关键词】 同步辐射背反射白光形貌术;
小角度晶界;
微管;
SiC;
升华法;
【Key words】 synchrotron radiation back reflection white-beam topography; low angle grain boundaries; micropipes; SiC; sublimation method;
【Key words】 synchrotron radiation back reflection white-beam topography; low angle grain boundaries; micropipes; SiC; sublimation method;
【基金】 国家高技术研究发展计划(863计划)资助项目(2004AA31G030)
- 【文献出处】 功能材料 ,Journal of Functional Materials , 编辑部邮箱 ,2006年12期
- 【分类号】O771
- 【被引频次】1
- 【下载频次】169