This is the effort of many people pushing for more development in green energy until it was able to be produced at a cost efficient way
I think this oversimplifies it a lot. There were a lot of different actors involved - I'm sure a lot of development was coming both from the semiconductor industry, and from state funded research, but in the end, the greed machine (aka capitalism) takes care of further researching and scaling it to the global level.
Also it's not like there wasn't any money in that business years ago - even back then solar was commonly used as a remote power source in mobile applications (calculators, camping and so on). Also NASA, but this was purely state funded