The No. 3 manufacturer of solar panels in 2009, Sharp  produces conventional crystalline-silicon panels. Increasingly focusing on amorphous silicon, the company has 320 megawatts online compared to 430 megawatts of crystalline-silicon capacity, says Greentech Media analyst Eric Wesoff.
The No. 1 thin-film solar manufacturer  was the world's largest solar manufacturer in 2009, with production capacity expected to be 2.7 gigawatts by 2012. It makes cadmium-telluride panels, which are more efficient than the amorphous silicon Applied Materials bet on. Annual revenue is in excess of $2 billion.
Energy Conversion Devices
The company produces the Uni-Solar brand of amorphous-silicon panels, which is foil based and flexible and can be attached to roofs like a sticker. ECD , which generates about $300 million in annual revenue, said in August that it was moving some of its 150-megawatt capacity to Mexico.
One of Applied Materials' only direct competitors in manufacturing has the tools to produce amorphous-silicon panels. VLSI Research ranks this subsidiary of the Swiss industrial Oerlikon  as the No. 1 solar turnkey supplier and named its line the "best technical product for thin-film manufacturing" last year.
This subsidiary  of the Japanese oil company Showa Shell Sekiyu began researching its copper-indium-selenium technology in 1993. It expects to ship more than 100 megawatts of panels this year and reach more than 1 gigawatt of capacity by 2011. In October, it signed a deal to supply General Electric-branded panels to GE.