Cathodoluminescence Study of 3C-SiC Epilayers Grown on 4H-SiC Substrates

Chen, Jun; Sazawa, Hiroyuki; Yi, Wei; Sekiguchi, Takashi

doi:10.1007/s11664-023-10336-7

Cited by 1 publication

(2 citation statements)

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“…Silicon Carbide (SiC) exhibits two polar surfaces in its hexagonal form, namely (0001) and 0001 , and two polar surfaces in its cubic form, namely (111) and 111 [1]. Of particular interest is the growth of 3C/4H-SiC on the carbon face due to the presence of polarization-induced bound charges and significant differences in the conduction band at the 3C/4H interface [10][11][12]. This configuration is expected to result in a higher concentration of two-dimensional electron gas (2DEG) at the 3C/4H-SiC interface [13], offering promising prospects for MOSFET structures [7].…”

Section: Introductionmentioning

confidence: 99%

“…When employing Raman spectroscopy to discriminate between these two distinct SiC crystal structures, the close proximity of their peak positions renders the FLO peak less suitable as a definitive criterion. Instead, the positions of the FTO peak in the Raman spectra are conventionally selected to distinguish between the two crystal structures [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Layered Epitaxial Growth of 3C/4H Silicon Carbide Confined by Surface Micro-Nano Steps

et al. 2023

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In this study, we used a horizontal hot-wall CVD epitaxy apparatus to grow epitaxial layers on 4° off-axis 4H-SiC substrates. Epitaxial films were grown by adjusting the flow rate of the source gas at different levels. With an increase in the source gas flow rate, a notable transition in the crystalline structure of the epitaxial layer was observed, gradually shifting from 4H-SiC to 3C-SiC. Furthermore, the quality of the epitaxial layer correspondingly exhibited degradation. Specifically, for epitaxial films grown under moderate gas flow rates, the central region demonstrated a crystalline structure of 4H-SiC, while the outer ring region exhibited a crystalline structure of 3C-SiC. Using a scanning electron microscope (SEM) to observe the transition zone of the two regions, a region of 3C/4H overlapping growth below it was found. Bright areas corresponded to 3C, while dark areas corresponded to 4H, as confirmed by Raman spectroscopy and other SEM images. The growth interfaces of the two crystal types were clearly discernible and relatively compact. Furthermore, the growth angles of the two crystal types and their correlation with the cutting direction strongly suggest that this overlap is related to the formation of micro-nano steps on the substrate surface.

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