MBJ Steady State Sun Simulator

The MBJ Steady State Sun Simulator is designed for the characterization of small modules in the development of new cell technologies such as perovskites in the laboratory.

The compact measuring system consists of a continuous light-capable sun simulator and an integrated electroluminescence camera. Modules up to a size of 450 x 450 mm can be tested.

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Technical details

Sun simulator

  • TÜV Rheinland certified LED light source (IEC 60904-9 Ed.3)
  • Spectral coverage > 98%
  • Spectral deviation < 24%
  • Spectrum Class A+ (IEC 60904-9 Ed.3)
  • Long-term instability (LTI) < +/- 1% Class A+ (IEC 60904-9 Ed.3)
  • Deviation of homogeneity < +/- 1% Class A+ (IEC 60904-9 Ed.3)
  • Reproducibility of Pmax, flash to flash < +/- 0.2% (absolute)
  • Electroluminescence camera with 12 MPixel
  • Automatic image capture, manual EL image evaluation


  • Heat exchanger liquid-air
  • Cooling capacity: 5000 W
  • Coolant: water or water/glycol
  • Operating temperature: 5°C up to 40 °C

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 %, 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 % under laboratory conditions.

Wide range of possible uses

The LED units with 22 different LED types are ideal for laboratory measurements. The spectrum and intensity of the solar simulator can be easily adapted to your own test scenarios. Thanks to its continuous light capability, the solar simulator can also be used for preconditioning or aging tests. The flash time can be varied from 100 - 500 ms.


Good scalability

The LED unit can be scaled almost as desired, meaning that systems for single cells and even systems for modules can be built.