Have prices actually increased? Lazard's Levelized Cost of Energy analysis shows a steady decline in cost https://www.lazard.com/media/451447/grphx_lcoe-09-09.jpg but that also includes operating costs. I can't find a source for the solar panels themselves.
They just didn't decrase as fast as they could have, given falling prouction cost. But then again, the market was heavily distorted by German and Chinese subsidys anyways, so it is hard to know what the subsidy-free "real" market prices would have been.
