ACCELERATED ULTRAVIOLET TEST AND HIGH TEMPERATURE TEST ON DIELECTRIC LIQUID FOR IMMERSING SOLAR CELLS

摘要

Solar cells immersed in dielectric liquid have an increased operating efficiency, and the cells can be cooled effectively by liquid. It is particularly important to the concentrated photovoltaic power system, as in the concentrated system excessive heat can generated due to high intensity irradiation, which can easily result in cell’s degradation due to experience high temperature. So we introduced a new active cooling method: direct contact heat transfer mode by immerging solar cells in dielectric liquid. In the immersed system both the front and back surface of the cells can be contact with liquid directly so that cells can be cooled more effectively than passive and conventional active cooling methods. But there is no study on the durability and stability of dielectric liquid immersing solar cells. Photon induced degradation may take place when cells operating in dielectric liquid for a long time. In order to apply this new method to practice, the system’s durability and stability must be studied. Accelerated ultraviolet test and high temperature (85°C) test were done on three dielectric liquids (such as silicon oil, glycerol) to test the liquid’s durability. Fourier transform infrared spectra indicate their molecule structures did not change, but some physical changes have happened.