SPACE CHARGE DISTRIBUTION IN PHOTOVOLTAIC CELL INSULATION

Vladimír Ďurman – Milan Perný – Vladimír Šály – Marek Pípa

   Near-electrode processes were studied in the thermoplastic polyurethane (TPU) insulation intended for encapsulation of photovoltaic cells. The analysis came out from the dielectric measurements in the region of very low frequency. The measurements showed that the observed phenomena is related to the electrode polarization. This type of polarization always influences the space charge distribution in material and also enhances the electric field near the electrodes. For practice, it is important to decide if the electric field enhancement is dangerous for proper operation of photovoltaic cell. Using the parameters obtained from dielectric measurements, the electric field distribution was calculated in the TPU foil. It was found that electric field increased more than 10-times in comparison with the initial value.

Keywords: polarization mechanism, electric field distribution, solar cell encapsulation, electrical conduction

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