A few years ago I read an article about how solar panels were about to gain efficiency after a widely-accepted "fact" in physics textbooks was shown to be wrong

A few years ago I read an article about how solar panels were about to gain efficiency after a widely-accepted "fact" in physics textbooks was shown to be wrong. If I recall correctly, it was some characteristic of electrons in the atomic structure. At the moment I can't find a reference. Anybody remember this?