CIGS selenization furnace

Copper indium gallium (di)selenide (CIGS)

Copper indium gallium (di)selenide (CIGS) is a semiconductor material composed of  copper, indium, gallium and selenium. CIGS is mainly used as light absorber material for thin-film solar cells in the form of polycrystalline thin films.
Perhaps the most common method used to create CIGS films for commercial use is deposition of precursor materials – always including Cu, In, and Ga, and sometimes including Se – onto a substrate and processing these films at high temperatures under a proper atmosphere.
The Se supply and selenization environment is extremely important in determining the properties and quality of the film produced from precursor layers. When Se is supplied in the gas phase (for example as H₂Se or elemental Se) at high temperatures the Se will become incorporated into the film by absorption and subsequent diffusion.
Differences exist between films formed using different Se sources. Using H₂Se yields the fastest Se incorporation into the absorber. Use of H₂Se also provides the best compositional uniformity and the largest grain sizes.

The sulfurization step appears to passivate the surface in a way similar to CdS in most other cells. Thus, the buffer layer used is Cd-free which eliminates the worries related to the toxicity and environmental impact of Cadmium.
Wilro Advanced Technologies is a major player and technology leader, providing several models of batch type CIGS vacuum diffusion furnaces suitable for selenization and sulfurization processes in CIGS solar cell manufacturing. Fast heating and cooling rates as well as excellent temperature uniformity and a homogeneous gas distribution makes Wilro’s CIGS selenization furnace an outstanding mass production tool. The key to your success!
Wilro also provides 3-axis boat handling solutions including substrate loading/unloading by robot with direct interface to any central conveyor transport system. Waste gas treatment solutions – e.g. dry bed absorber/wet scrubber – are also available and can be offered based on customer’s plant lay-out.