We all know wide bandgap semiconductors, currently galium nitride and silicon carbide are the superstars becose many companies make them at relatively reasonable price. They aren't just mere lab curiosities but very real choices.
There are also many more wide bandgap semiconductor materials with even higher bandgaps such as diamond, silicon nitride, boron nitride, silicon dioxide and aluminum nitride a.k.a. AlN.
I read on wikipedia that military uses AlN transistors, which means they are actively produced somewhere. Do you know any manufacturer that makes AlN transistors? I want to know if there is currently any commercialy avaliable AlN transistor.
Last thing I want to add to prevent potential mistake, aluminum nitride have also high thermal conductivity, it’s a frequent substitude for toxic beryllium oxide used in transistor as heat spreader thermal material. I am looking for transistor that uses it as semiconductor, not as heatsink.