You're correct that SiC is for medium to high voltage. But there's also GaN, which is for low to medium voltage, and already works in the millivolt range. Both

You're correct that SiC is for medium to high voltage. But there's also GaN, which is for low to medium voltage, and already works in the millivolt range. Both GaN and SiC will have wider ranges in the future as the technology continues to improve.