Desing of a combined direct and diffuse illumination unit for solar cell chacterization

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Dr. Plesz Balázs
Department of Electron Devices

In the 21 century the renewable energy sources, such as solar power, are getting more and more popular. The benchmarks are high, since every company has a common goal, the production of higher efficiency and cheaper solar cells. Besides the commonly known silicon-based PV cells, new structures are about to appear, like the organic solar cells. Under different environmental conditions their response to the same exposed light can be very different compared to conventional structures. Therefore new, complex testing method needs to be designed.

My goal was the development of a non-conventional testing set-up. To achieve this – vary from the existing manners – I analyzed the prospect of simulating environmental lights, where both the direct and diffuse lights can be adjusted according to the requirements.

Besides determining the intensities needed, I had to design a proper diffuse illuminating device. My choice were high-power, white color LED’s placed inside of an integrating-, otherwise known as Ulbricht sphere, that can produce an uniform distribution of lights.

First I designed a smaller, test board, on special MCPCB. Since the extremely high power dissipation I had to cool the system with circulating cold water. After thermal simulations and measurements on this prototype, I refined the designs, and designed the final panel.


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