The CIGS Solar Cell Group operates an R&D pilot line for CIGS (and later also CZTS) solar cells and mini-modules, using glass substrates with a size of up to 300 mm x 300 mm. The p-type CIGS absorber layer is formed in a two-stage process: magnetron sputtering of a Cu-Ga-In precursor followed by crystallisation at high temperature in a Se and S containing environment. A heterojunction diode is then formed by chemical bath deposition of a thin CdS buffer layer. In parallel to R&D on this baseline CIGS solar cell, the group is also working on the development of Cd-free buffer layers, for example through ZnOS deposition using magnetron sputtering. The group’s broad goal is to develop robust and cost-effective fabrication sequences for high-performance thin-film PV modules.
For further information, please contact:
Dr Selvaraj VENKATARAJ
Head, CIGS Solar Cell Group