Electroluminescence and Photoluminescence Inspection of Solar Cells & Modules

Solar Cells and Solar Modules suffer from a variety of invisible defects which reduce their output power and long-term stability. The highly sensitive Inspection Systems from greateyes image these problems. This allows you to optimize the production, increase output power and reduce overall costs.

Advantages of Electroluminescence (EL) and Photoluminescence (PL) Inspection 

• EL and PL are non-destructive methods
• Measurements deliver detailed information about defects and their location
• EL and PL provide a high informative content, many types of defects can be clearly identified
• Fast measurement on a second timescale
• EL can be used to investigate small cells as well as large areas made from mono-Si, poly-Si, a-Si, micro-Si, CIGS, CIS, CdTe
• Method can be integrated in the production process (in-line)
• EL and PL are also well suited for research and development of new photovoltaic devices

Differences between Electroluminescence (EL) and Photoluminescence (PL) Inspection 

	Electroluminescence	Photoluminescence
Requirements	Electrical contacts are necessary.	No electrical contacts needed.
Substrates	Solar Cells, Strings, Modules	Wafers, Solar Cells
Materials	mono-Si, poly-Si, a-Si, micro-Si, CIGS, CIS, CdTe	mono-Si, poly-Si
Measurement time	>0.5-1sec for mono-Si or poly-Si	>1sec for mono-Si, poly-Si
Informative Value	Cracks, Shunts, Finger defects, Deposition problems, bad edge isolation, ...	similiar to EL, problems of the electrical grid system typically not visible