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Epitaxial growth of high quality SiC by sublimation close space technique

机译:升华近空间技术外延生长高质量SiC

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摘要

Semiconducting SiC is expected for power devices and higher breakdown voltage of the device is required. Growth rate of epilayer by conventional CVD is about 3 mu m/h. To make a thick epilayer, more that 10 hours are needed. To minimze the growth time, we propose sublimation epitaxial method by close space technique (CST). In the CST, source (polycrystalline 3C-SiC plate) and substrate is closely separatedf by spacer and source material is sublimed and transferred to the substrate in argon. Epitaxial layers with specular suface were obtaiined on 6H-SiC substrates at a substrate temperature around 2200 deg C and growth rate was about 100 mu /h. Nitrogen-bound exciton was observed by PL measurement at 2K in the epilayer w hen 3C-SiC plate with high purity was employsed as the source material. Crystallinity o f the epilayer was characterized by Raman spectroscopy.
机译:半导体SiC有望用于功率器件,并且需要更高的击穿电压。通过常规CVD的外延层的生长速率约为3μm/ h。要制作厚的外延层,需要10个小时以上。为了最小化生长时间,我们提出了通过密闭空间技术(CST)的升华外延方法。在CST中,源(多晶3C-SiC板)和基板之间通过垫片紧密隔开,源材料升华并在氩气中转移到基板上。在约2200摄氏度的基板温度下,在6H-SiC基板上获得具有镜面表面的外延层,生长速率约为100微米/小时。当使用高纯度的3C-SiC板作为源材料时,通过在外延层中于2K的PL测量观察到氮结合的激子。外延层的结晶度通过拉曼光谱法表征。

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