Design of an irradiation unit for a solar cell characterization system

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Dr. Plesz Balázs
Department of Electron Devices

In my thesis I designed a complex solar-simulator, which can simulate combined light-distribution and temperature conditions.

Several solar cell structures and materials exist, which can behave differently under the same light- and temperature conditions. I look into the most common solar-cell build up’s, and base materials. After I get acquainted with the 3 basic standards regarding the solar simulators (ASTM E 927-05, JIS C 8912-1998 és IEC 60904-9), I inspect the build-up’s of solar simulators. Most of them can simulate the solar spectrum quite accurately beside meeting the standards. The irradiation reaching the Earth surface consists of two elements, the direct and diffuse sunlight. Since the diffuse component can reach high intensities, it cannot be omitted from simulations.

The diffuse irradiation spectrum and distribution vary from the direct radiation. The light rays received from the whole field of view, therefore we need an equipment, where simulating this distribution is possible. The integrating sphere can create an uniform distribution of light, making it ideal for this application.

My goal was to create an equipment, that can simulate simultaneously the direct and diffuse component. I am using an integrating sphere, different wavelength LEDs for the diffuse, and a halogen light source complemented with white LEDs for the direct irradiation simulation.

I also designed and made a control unit, that can control the equipment via the computer.

This setup can provide simultaneously the direct and diffuse sunlight. For solar cell testing we can install the solar cell on a thermal interface, for thermal measurements.


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