CIGS-Baseline

The CIGS-Baseline is capable of manufacturing 30 x 30cm² Cu(In,Ga)Se2 PV-modules employing a sequential processing route. Starting with glass cleaning the 30 x 30cm² substrates are coated with a SiOxNy barrier layer followed by molybdenum (Mo) back contact doped with sodium (Na), both using magnetron sputtering technology. In case of module manufacturing a monolithically interconnection is employed; first P1 scribe-lines are created by laser ablation separating the Mo back contact. As next step the metal precursor layer (CuInGa) is deposited again using magnetron sputtering. To finish the stacked elemental precursor layer (SEL) selenium (Se) is coated onto of the metal layers by thermal evaporation in high vacuum. The formation of the chalcopyrite absorber layer is performed in a quartz-lamp heated rapid thermal processing (RTP) furnace. Afterwards the pn hetero-junction is formed by chemical bath deposition (CBD) of a cadmium-sulfide (CdS) buffer layer. Alternative Cd-free buffer layers such as zinc-oxid-sulfide (Zn(O,S)) could also be applied. Finally a transparent intrinsic-ZnO / aluminum doped ZnO (i-ZnO/AZO) bilayer front contact is deposited by magnetron sputtering. Additional interconnection scribe lines (P2,P3) are created after junction formation and front contact deposition either by mechanical scribing or laser ablation. To perform durability-tests of PV modules the active layers can be encapsulated to protected them from environmental impact. An overview poster of our CIGS baseline was presented at the 27. EUPVSEC in Frankfurt/Main, 2012.

Goal of this CIGS-baseline is providing a stable semi-industrial processing route as benchmark for new materials and processes. Currently we are testing new buffer layer deposition techniques and atmospheric pressure selenization processes.

Schematic description of the CIGS baseline process at PVcomB on 30 x 30 cm². Comprehensive analytics of processes, layers and devices are integrated along the whole production line.



Our service

    • R&D projects to increase efficiency of sequentially processed CIGS solar cells / modules
    • Benchmarking of alternative manufacturing methods (cross experiments)
    • Test of novel deposition techniques of precursor, CIGS absorbers, buffer, contact layers employing the PVcomB CIGS-Baseline-Technology
    • Optimizing of manufacturing processes
    • Test of novel encapsulation materials / methods

Projects & collaborations

In frame of our CIGS activities we are collaborating with several partners from industry and research institutes.

Both public funded projects and bilateral alliances are used to push the CIGS technology and develop future solar module concepts.