One month after Tesla recalled more than 120,000 units of its Model 3 in China, allegedly due to defects in rear motor inverters, the real causes of the defects remain unclear. As Tesla is the first carmaker to use silicon carbide (SiC) metal-oxide-semiconductor field-effect transistors (MOSFETs) in commercial cars, the recall has sparked debates about the reliability of SiC – the third-generation semiconductor material that is gaining favor.