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首页> 外文期刊>Journal of Crystal Growth >Threading dislocation propagation in AlGaN/GaN based HEMT structures grown on Si (111) by plasma assisted molecular beam epitaxy
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Threading dislocation propagation in AlGaN/GaN based HEMT structures grown on Si (111) by plasma assisted molecular beam epitaxy

机译:通过等离子体辅助分子束外延在Si(111)上生长的AlGaN / GaN基HEMT结构中的位错传播

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摘要

A transmission electron microscopy (TEM) study was carried out on a series of AlGaN/GaN high-electron mobility transistor (HEMT) structures grown by plasma assisted molecular beam epitaxy (PA-MBE) on Si (111). Threading dislocation (TD) behavior and density were investigated for three heterostructures using an AIN/GaN superlattice and/or differently strained GaN layers. Threading dislocation densities (TDDs) were measured by TEM (at different depths) and high resolution x-ray diffraction (HRXRD) allowing one of the most complete and few studies so far, presenting separated values on edge, screw and mixed type TDs quantities.
机译:对通过等离子辅助分子束外延(PA-MBE)在Si(111)上生长的一系列AlGaN / GaN高电子迁移率晶体管(HEMT)结构进行了透射电子显微镜(TEM)研究。使用AIN / GaN超晶格和/或不同应变的GaN层研究了三种异质结构的螺纹位错(TD)行为和密度。螺纹位错密度(TDDs)通过TEM(在不同深度)和高分辨率X射线衍射(HRXRD)进行测量,是迄今为止最完整,很少研究的一项,在边缘,螺杆和混合型TDs量上给出了分离的值。

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