膜层结构对光伏镀膜玻璃的影响研究

RESEARCH ON INFLUENCE OF FILM STRUCTURE ON PV COATED GLASS

为更好地分析和评估膜层结构对光伏镀膜玻璃的影响,对采用不同厚度、不同膜层结构的光伏镀膜玻璃的光学性能、膜层铅笔硬度、膜层微观结构进行了对比,分析了不同类型环境老化试验对光伏镀膜玻璃性能的影响,并研究了不同膜层结构对光伏镀膜玻璃性能的影响机理。研究结果表明:在光伏玻璃表面镀减反射膜能有效提升其光学性能,在380~1100 nm波段,相较于3.2 mm光伏玻璃原片,3.2 mm单层和双层镀膜玻璃的平均太阳光有效透射比增益分别为2.27%和2.50%;光伏镀膜玻璃的光学性能受膜层结构、膜层厚度及膜层孔隙率的影响,单层镀膜及双层镀膜表层膜孔隙率均约为49%,双层镀膜底层膜的孔隙率约为12%;双层镀膜玻璃的膜层铅笔硬度比单层镀膜玻璃的低,主要是因为表层膜的Si—O—Si网络结构建立在底层膜的网络结构上,表层膜与底层膜之间的结合力低于网络结构与玻璃基体之间的结合力;双层镀膜玻璃由于有1层致密底层膜,能有效阻隔水汽及污染物与玻璃基体发生反应,使其具有更好的耐环境老化性能。

In order to better analyze and evaluate the influence of film structure on PV coated glass,this paper compares the optical properties,film pencil hardness,and film microstructure of PV coated glass with different thicknesses and film structures.The influence of different types of environmental aging tests on the performance of PV coated glass is analyzed,and the mechanism of the influence of different film structures on the performance of PV coated glass is studied.The research results show that coating anti reflective film on the surface of PV glass can effectively improve its optical performance.In the wavelength range of 380~1100 nm,compared to the PV glass with thickness of 3.2 mm,the average effective solar transmittance gain of single-layer and double-layer coated glass with thickness of 3.2 mm is 2.27%and 2.50%,respectively.The optical properties of PV coated glass are influenced by the film structure,film thickness,and film porosity.The porosity of both single-layer and double-layer coating surface films is about 49%,and the porosity of the double-layer coating bottom film is about 12%.The film layer pencil hardness of double-layer coated glass is lower than that of singlelayer coated glass,mainly because the Si—O—Si network structure of the surface film is built on top of network structure of the bottom film.The bonding force between the surface film and the bottom film is lower than that between the network structure and the glass substrate.Double-layer coated glass has a dense bottom film,which can effectively block water vapor and pollutants from reacting with the glass substrate,making it have better environmental aging resistance.