it's my understanding that the concept of "electron holes" originated with the advent of solid state semiconductors.
it is the basic premise of the theory underlying their operation.
these "holes" are introduced into the crystal lattice by the manufacturing process called doping.
It has been a long time, but I believe I heard of the "hole" flow concept even as far back as the mid 1960s. At that time it was presented as, a positive flow or hole flow, moving in the opposite direction, to the negative electron current in a conductor. I am fairly certain it was also involved with early transistor, developement.
But, like I said it has been a long time.....