MBJ Light Soaking Unit

The MBJ Light Soaking Unit is designed for the development of new cell technologies such as perovskites. The basis is a 380x380mm LED unit with two separately controllable channels (blue/green and IR). The LED units are designed for continuous operation. Cooling units are required for continuous operation. Each LED channel delivers 1000W/m² at approx. 50% of the permissible current. This design achieves a service life of > 50,000 hours. The units can be used individually as a test bench for aging tests for solar cells or arranged in series for preconditioning in cell production before I/V measurements.

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Technical details

Lighting unit

Size LED Board: 380 mm x 380 mm
Uniformity: Better than +-5% in the 220 mm x 220 mm area
Working distance: 250 mm +/- 20mm
LED configuration: Two channels which can be operated independently of each other.
Power approx. 1,000 W/m² at 50% of the maximum continues load of the LED
Channel 1: 450 nm and 520 nm (other on request)
Channel 2: 940 nm (other on request)
Service life: @ 1,000 W/m² operating time of 50,000 hours
Operating modes: Continuous light and flash mode
Cooling: LED board is attached to a water-cooled plate (not included)

Development of perovskite solar cells

Today, solar cells made of silicon are the standard. In the laboratory, silicon solar cells achieve efficiencies of almost 27 percent, which is close to what is theoretically possible.

Higher efficiencies are only possible with new materials. A promising approach is the production of tandem solar cells made of perovskite and silicon. While silicon absorbs the red and infrared wavelengths of the solar spectrum particularly well, the perovskite crystal absorbs green and blue light particularly well. The combination of the two materials to form a tandem solar cell can then absorb more light and thus achieve higher efficiencies.

Tandem solar cells now achieve efficiencies of 33.9 percent under laboratory conditions.

A wide range of possible uses

The LED units were originally designed as test stations for aging tests on tandem solar cells. There are now also applications in the area of preconditioning solar cells before measuring the current/voltage characteristic curve. An arrangement as a surface light for applications in the module area is also possible.

It is important to know that the LED types can be varied depending on requirements.