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Flexible Cu(In,Ga)Se2 (CIGS) solar cells are very attractive because of their high conversion efficiencies, their low cost potential and the many application possibilities. They can be grown on metal or polymer substrates with a variety of deposition methods. The conversion efficiency depends on the choice of the substrates and of the processing technology. Higher efficiencies are achieved on metal foils than on polymer and by using vacuum evaporation methods. Solution based methods for CIGS deposition yield lower efficiencies, but offer other advantages. For industrial application roll-to-roll deposition and interconnected modules are required. Monolithic interconnection technologies for flexible CIGS modules are not yet fully developed on industrial scale. And cost effective encapsulation facilitating stable outdoor performance for more than 20 years is still a challenge. In this chapter an overview of the state of the art of flexible CIGS solar cells and their issues is presented.

Investigation and development of CIGS solar cells on flexible substrates and with alternative electrical back contacts