Annealing Temperature Effect on the Hydrophilic Coating Film for the Cover Glass of the PV Module

초록

The optical and mechanical characteristics of a novel hydrophilic coating material are introduced according to the annealing temperature. As a water-based SiO2-abundant material has perfect transparency, as does glass, and a hydrophilic property, it can be applied to the protective glass for a PV module. After the coating process on the glass substrate, the film was cured at different annealing temperatures of 200-500 degrees C in 100 degrees C increments. A UV-visible spectrometer was utilized to measure the optical transmittance of the film. To verify the mechanical properties, the hardness and adhesion of the film were tested using ASTM standard methods. 9H hardness and 5B adhesion were achieved. Self-cleaning characterization was performed with artificial pollutants and with simple watering of the samples. Moreover, the self-cleaning experiment was conducted on a real-sized 40 x 40 cm(2) solar panel cover glass with successful results.

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