

I don’t think it was even a matter of research, or it least it hasn’t been for a while, more it’s a matter of scaling production and competitive supply chains.
If there are 15 steps to produce a panel and you need to make 20% profit to pay off the capital expense and cover fixed costs, then the final product is going to be expensive, if the scale is large enough to afford to only make 1% profit at every step things get cheap.

But gas is also more profitable than ever for those involved. Any increase in price gets passed along to down stream consumers, but the margins have increased.
And since the people deciding what electrical generation are getting put in are not the ones paying the final bill, they have no reason to pursue solar at scale.
Some places are installing it at scale, but it’s almost always due to some public mandate, or because the people putting it in are the ones paying for the final power.