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Flexible and lightweight solar cells and modules fabricated with thin-film absorbers can be installed in places where weight restrictions are severe, such as the curved surfaces of construction materials,car roofs, and portable devices.Thus, a wide variety of applications different from that of conventional rigid panel modules are expected.Cu(In,Ga)Se2 (CIGS) is one of the most promising materials for highly efficient flexible solar cells because of their high cell efficiency among thin-film solar cells[1].To date, there have been numerous attempts to fabricate flexible CIGS solar cells using metal foils, polyimide, and other flexible substrates.Owing to the worldwide continuous efforts,energy conversion efficiencies of flexible CIGS solar cells and modules have been dramatically enhanced for the last several years and are now comparable to those of cells and modules fabricated on rigid glass substrates[2-4].Nonetheless, a lot of different techniques from those for rigid panel modules are required to fabricate flexible cells and modules.With the advent of practical flexible CIGS modules, it is expected to have significant ramifications on manufacturing processes.In this paper, the fundamental technologies for the fabrication of high-efficiency and low-cost flexible CIGS cells and modules are discussed.The recent progress in the R&D for flexible CIGS devices in AIST is introduced.[1] M.A.Green, et al., Prog.Photovolt.20 (2012) 606-614.[2] S.Niki, et al., Prog.Photovolt.18 (2010) 453-466.[3] S.Ishizuka, et al., Sol.Energy Mater.Sol.Cells 94 (2010) 2052-2056.[4] A.Chiril*, et al., Nature Materials 10 (2011) 857-861.