Preparation And Optical Properties Of Solar Photovoltaic Glass Antireflection Coatings

Silica is commonly used to prepare solar photovoltaic glass antireflection coating to improve solar energy utilization rate due to its low refractive index,simple preparation process and low cost.To keep it clean,outdoor packaging glass typically has an effect that prevents dust and water from adhering to the surface of the nanostructure.In other words,anti-reflective coatings(ARC)generally have better hydrophilic or hydrophobic properties to prevent dust from accumulating on the solar photovoltaic module.In this thesis,a series of studies on the preparation of inorganic-organic hybrid silica antireflection coatings based on sol-gel method have been carried out,including the following two parts:(1)Preparation of anti-fog and anti-reflective multifunctional silica sol-gel antireflection film.A highly transparent hydrophobic silica anti-fog anti-reflection coating was prepared by sol-gel method using inorganic-organic hybridization.The effects of solvent type,amount of fluorosilane(FDS),coating method,spin speed(film thickness)and heating temperature on the transmittance,anti-fog performance and stability of antireflective coating on photovoltaic glass surface were studied.Then obtained the optimal formulation and preparation process of the inorganic-organic hybrid silica anti-fog and anti-reflection sol.The properties of the antireflective coating was characterized by UV-Vis,atomic force microscopy(AFM),Fourier transform infrared spectroscopy(FTIR),X-ray diffractometry(XRD)and scanning electron microscopy(SEM).The results show that the single-layer antireflection coating prepared by spin-coating of fluorosilane and tetraethyl orthosilicate(TEOS)with a molar ratio of 0.0267 : 1 can achieve a maximum penetration rate of 5.9 in the visible range of 400 ~ 800 nm,and the film layer has better anti-fogging property.The sol prepared by the process of the present invention has good stability,and the transimittance of antireflection film prepared by the hybrid sol after aging for 6 months can still enhanced by 3%(2)An inorganic-organic hybrid hydrophilic antireflection coating was prepared by a twostep sol-gel method.First,the acid catalyzed hydrolysis of ethyl orthosilicate to form a silica sol,followed by the addition of hydrophilic siloxane 3-(trimethoxysilyl)propyl ester(KH570),cosolvent isopropanol,etc.,followed by a second step of sol-gel reaction to form a hydrophilic inorganic-organic hybrid.UV-Vis,AFM,FTIR,XRD,SEM,etc.were used to characterize the properties of the film.The effects of different silane content on the optical prperties of the film were studied.The prepared by the molar ratio of silane 3-(trimethoxysilyl)propyl ester(KH570)and tetraethyl orthosilicate(TEOS)to 1:2 is spin-coated and subsequently heated 10 min at a temperature of 200 °C,the average transmittance is 94.5%,the maxium transmittance reached 96%,and transmittance reached is enhanced by 3.5% compared with the uncoated substrate.In addition,the pencil hardness test,acid and alkali immersion test and 3.5% NaCl immersion test of the coating show that the antireflective film for hydrophilic photovoltaic glass prepared in this paper also has good toughness,mechanical properties,acid resistance and salt water immersion resistance characteristics.