Reddit reviews Fundamentals of Semiconductor Fabrication

During my engineering degree I studied semiconductors extensively. The two books I would recommend to you are Pierret for device fundamentals, and I think this is what I used for device fab. Since your lab does optoelectronics, I'll also recommend Kasap. These are all very much engineering oriented, so they are good if you're looking for a functional understanding of how these devices work.

Also, some of the solid state physics (learning about density of states, electronic structure, etc.) is probably better learned from Mermin and Ashcroft.