ILIT

The ILIT system (Illuminated Lock-In Thermography) which was developed in cooperation with the Fraunhofer ISE research institute is a solution for spatially resolved imaging of solar cell power losses. This is a key issue for identifying technological and material quality problems and realistically judging their influence on solar cell performance.

Up to now, a spatially resolved image of leakage currents could only be obtained by dark lock-in thermography (DLIT) measuring the distribution of the dark leakage current in solar cells. However, it is well known from simulations that the dark and illuminated current paths in solar cells may differ considerably. Spatially resolved images of power losses in solar cells can now be measured under illumination in different modes to show different loss mechanisms:

Voc-ILIT: Material quality in total
Mpp-ILIT: Total power losses
Jsc-ILIT: Contact resistance problems

Technical Specification

• Fast, high precision IR camera with high resolution, frequency up to 120Hz, 400 Hz as option
• Homogeneous laser beam irradiation on large area (1 Sun)
• Laser proof housing with security locked doors
• Cell size up to 156x156 mm (ILIT 156)
• Cell size up to 210x210 mm as option (ILIT 210)
• 4-quadrant power supply
• 4-wire contacting of the solar cell
• CDI, ILIT and SRI also available in combination as IR-Multitool 210