I think this article does a pretty poor job of explaining the most interesting and exciting idea that I think is at the core of semi-conductors. Which is that y

I think this article does a pretty poor job of explaining the most interesting and exciting idea that I think is at the core of semi-conductors. Which is that you can go from the energy levels of electrons in an atom - using the electron shell concept that you already know from school, and translate that into how current flows in a semi-conductor lattice - and that not only do we get current flow when electrons move into higher energy levels, but that you see an opposite effect where holes flow the other direction. To me, that seems like something extremely well suited for visualization and this explanation does none of that. The reason I think this is so important is because between understanding that, and understanding how doping works, the logic of everything else is very intuitive. Give me some energy band diagrams!