GreatCell Solar Limited (ASX: GSL) previously known as Dyesol, was a solar energy company developing perovskite solar cell 3rd generation thin-film solar cell technologies and materials. The company was previously focused on developing dye-sensitized solar cell (DSC or DSSC) technology but then focused on perovskite solar cells, and assisted manufacturing partners to produce perovskite photovoltaic modules. The company was based in Queanbeyan, Australia and opened its manufacturing and research facilities in October 2008. It expanded to several locations around the world, including the UK and Switzerland, and established joint ventures in South Korea and Singapore.