In-situ and ex-situ Characterizations of PVT-grown 4H-SiC Single Crystals
材料科学
原位
光电子学
结晶学
化学
有机化学
作者
Qinqin Shao,Ruohan Shen,He Tian,Xiaodong Pi,Deren Yang,Rong Wang
出处
期刊:Journal of Physics D [IOP Publishing] 日期:2024-08-22卷期号:57 (47): 473002-473002
标识
DOI:10.1088/1361-6463/ad7149
摘要
Abstract 4H silicon carbide (4H-SiC) is one of the most promising candidates in high-power and high-frequency devices, owing to its excellent properties such as wide bandgap, high electron mobility, high electric breakdown field and high thermal conductivity. The physical-vapor-transport (PVT) approach has been broadly adopted to grow 4H-SiC single-crystal boules. Because of the high-temperature growth of 4H-SiC single-crystal boules, the PVT system is a ‘black-box’ system, which decreases the yield and thus increases the cost of 4H-SiC single-crystals. Although advanced modern characterization tools, e.g. atomic force microscopy, x -ray topography, x-ray diffraction and Raman scattering spectroscopy, can provide deep insight into the structural and defect properties of 4H-SiC boules, it is rather limited to gain in-situ information of the growth process by these ex-situ methods. Therefore, the in-situ visualization on the evolution of structural morphologies and defects conducted by x -ray computed tomography ( x CT) is of great importance for further development. In this topical review, the application of the x CT technology on the in-situ visualization of the evolution of the growth front, growth rate, defects, and the mass transport of the source material of 4H-SiC are reviewed. The ex-situ characterization of 4H-SiC single-crystal boules are also briefly introduced. This topical review provides insight into the growth process, structural morphology, and defect evolution of PVT-grown 4H-SiC single-crystal boules.