Characterization of Hydrophilic Coating Film for Photovoltaic Module Cover Glass with Different Coating Method

초록

In this paper, a novel anti-pollution coating film developed to enhance the self-cleaning property of glass for the photovoltaic (PV) module is introduced. In the PV system, modules are exposed to pollutants like dust and bird excrement. The coating material was applied to a substrate using different coating methods: spraying, dipping, and brush/fabric coating. The mechanical, optical, and self-cleaning properties of the thin coating layer applied using these three different methods were characterized through surface profile measurement; hardness, adhesion, and contact angle measurement; light transmittance measurement; and a water cleaning test. 9H hardness and 5B adhesion were achieved. Among the coating methods, the bar coating method showed the thinnest film layer, the lowest contact angle (10.6 degrees), and the best water self-cleaning result. Also, the bar-coated film had more than 90% average light transmittance.

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