Re: "university education"
But holes are not positrons. You can use the analogy as an aid to understanding, but likeall analogies it doesn't stand up to scrutiny if you look into great detail - if it did electron holes would annihilate with electrons and they don't, as shown by the fact that you don't get photons emitted from most semiconductor devices under normal operation. an electron hole is just that - an absence on a electron. It's not a particle of antimatter. It realeases energy which we like to call the band-gap
As with most university education, you learn how to teach yourself as much as you need to know. For the great majority of electrical/electronic engineers, a "positron as a electron hole" analogy works well enough. But it isn't completely true, and it's not good enough if you're creating detectors for CERN for example.