This announcement by ST is really a good starting point then, a proverbial wafer over the phase, but ST should be some decades from being 200 mm self-enough. This can be reflected inside the closing statement that ST intend to ‘source over 40% of its SiC substrates internally by 2024’. https://edgarcauog.affiliatblogger.com/65054167/a-simple-key-for-bare-die-silicon-carbide-schottky-diodes-unveiled