Abstract
The 4H-SiC (0001) surfaces before and after pulsed laser cleaning (PLC) have been investigated by I–V, C–V, and time-of-flight (TOF) measurements. The electrical characteristics for metal/4H-SiC structures were improved by PLC at the laser energy density of 30 mJ/cm2. The ideality factor and the pinning degree for metal/4H-SiC structures decreased by using PLC at 30 mJ/cm2 prior to metallization. TOF measurements indicate that atoms on 4H-SiC surfaces are desorbed by pulsed laser irradiation above 30 mJ/cm2. We found that pulsed laser irradiation at 50 mJ/cm2 causes decomposition of 4H-SiC surfaces. We discuss the laser energy density dependence of PLC of 4H-SiC (0001) surfaces.
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