There are quite a few materials which outperform straight silicon, but it is hard to compete with the gigantic amount of existing silicon infrastructure, except

There are quite a few materials which outperform straight silicon, but it is hard to compete with the gigantic amount of existing silicon infrastructure, except for very niche applications. https://en.wikipedia.org/wiki/High-electron-mobility_transistor https://en.wikipedia.org/wiki/High-electron-mobility_transis...