GT Advanced Technologies (formerly GT Solar International) is a beacon on the path of the solar power supply chain. The company manufactures the equipment used by other companies to produce silicon wafers and solar cells. Key products include chemical vapor deposition (CVD) reactors used to produce polysilicon, the raw material in solar cells; and directional solidification systems (DSS), the furnaces used to transform polysilicon into ingots, which are sliced into silicon wafers to become solar cells. GT Advanced Technologies does most of its business in Asia, primarily in Malaysia. In 2014 the company filed for Chapter 11 bankruptcy protection. It left bankruptcy in 2016 after a financial restructuring.