Micro-Raman map of stacking faults in 3C-SiC
The semiconductor industry is currently experiencing a strategic shift toward Cubic Silicon Carbide (
) for next-generation power electronics. This wide-bandgap (WBG) material offers exceptional electron mobility and thermal stability, positioning it as a superior candidate for MOSFETs and Schottky barrier diodes. However, the primary commercial advantage of — the ability to undergo heteroepitaxial growth on large-area silicon (
) substrates — introduces significant manufacturing challenges.
The fundamental lattice mismatch (20%) and thermal expansion mismatch (8%) between and generate substantial residual stress. This stress results in a complex landscape of crystallographic irregularities, including stacking faults (SF), anti-phase boundaries (APB), and 4H-SiC polytype inclusions.
HORIBA’s multimodal optical strategy, integrating Micro-Raman spectroscopy, Steady-state Photoluminescence (PL), and Time-resolved Photoluminescence (TRPL), provides the definitive non-destructive solution for mapping these defects. By correlating structural anomalies with electronic carrier-lifetime behavior, this integrated workflow enables precise process control and accelerates the transition of to high-volume manufacturing.
The primary method for non-destructive characterization of is a multimodal optical workflow. Micro-Raman spectroscopy is utilized to analyze phonon modes and selection rules, providing a high-resolution map of lattice strain and crystalline quality. A critical component of this analysis is the Longitudinal Optical Phonon-Plasmon Coupled (LOPC) mode, which allows for the precise determination of carrier concentration without contacting the wafer. Furthermore, Photoluminescence (PL) imaging identifies excitonic transitions and deep-level emissions associated with specific structural flaws.
The most prevalent extended defects in layers grown on silicon are stacking faults (SF), anti-phase boundaries (APB), and microtwins. These defects typically originate at the / interface due to misfit dislocations. If left unmanaged, these irregularities act as non-radiative recombination centers, significantly reducing carrier lifetime and increasing leakage current in power devices.
Nitrogen is the standard dopant used to achieve n-type conductivity in . However, there is a known trade-off between carrier concentration and structural integrity. High levels of Nitrogen substitution can stabilize the formation of stacking faults, leading to a higher defect density. HORIBA’s Raman-PL systems enable engineers to monitor this balance by simultaneously measuring the LOPC mode shift (carrier concentration) and the intensity of defect-related PL peaks.
is preferred for power electronics due to its high electron mobility, high saturated electron velocity, and its unique compatibility with large-scale silicon substrates. Its 2.36 eV bandgap allows it to function in harsh environments where standard silicon fails. By leveraging the global silicon fabrication ecosystem, reduces wafer costs and accelerates time-to-market for wide-bandgap performance in mainstream applications like electric vehicles and RF electronics.
Original Article: Read the full Semiconductor Digest study on 3C-SiC Defect Analysis
Product Solution: Explore HORIBA Raman and PL Solutions for Semiconductors
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