The rapid progress that is being made with inorganic thin-film photovoltaic (PV) technologies, both in the laboratory and in industry, is reviewed. While amorphous silicon based PV modules have been around for more than 20 years, recent industrial developments include the first polycrystalline silicon thin-film solar cells on glass and the first tandem solar cells based on stacks of amorphous and microcrystalline silicon films ("micromorph cells"). Significant thin-film PV production levels are also being set up for cadmium telluride and copper indium diselenide. (C) 2009 Elsevier B.V. All rights reserved.