From KurzweilAI.net, thin-film solar cells are a very promising technology in making solar more affordable and feasible. According to the linked article this tech looks to continue its strong growth.
Thin films: ready for their close-up? Nature News, July 30 2008 New thin-film solar cells may enable solar-cell technology to maintain its 50% annual growth during the past five years.
Candidate materials to replace today’s amorphous silicon include cadmium telluride, CIGS (copper indium gallium diselenide), and dyes painted onto the surface of nanometer-size particles of titanium dioxide.
In sunny climates, the technology is expected to lead to “grid parity” — electricity generated by photovoltaics as cheaply as it is sold by utilities — within four years or so.
David Kirkpatrick 
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