I have some background in this space in undergrad. Non Si materials are used in industry, germanium is used in some special applications and i believe its the #2 semiconducting material, however it is harder to use than Si because it's very difficult to keep it clean of impurities. Not the doping kind.

Source: I helped with a research project using Ge. Here's the paper if anyone is curious https://ieeexplore.ieee.org/abstract/document/8653561