Reactions involving photovoltaic cell

In the knowledge field of semiconductors, the boundary between the Chemistry and Physics is blurred and in fact not that much important.

In chemistry terms, in a silicon-based photovoltaic cell, you may think about a covalent bond between two Si atoms being photochemically broken into a free(-ish) electron and a delocalized positive charge. What happens next can be called chemistry only by forcing the definition of chemistry.

I think that for understanding the photovoltaic cell (as well as other varieties of the semiconductor diode) some chemical literacy is required, but the whole thing cannot be pushed into the chemistry frame.