Effects of polysiloxane doping on transmittance and durability of sol–gel derived antireflective coatings for photovoltaic glass

• Published in: Solar energy Vol. 86; no. 11; pp. 3345 - 3352
• Main Authors: Xin, Chongfei, Peng, Cheng, Xu, Yudong, Wu, Jianqing
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2012; Elsevier; Pergamon Press Inc
• Subjects: Abrasion-resistance; Analyzers; Antireflective coating; Applied sciences; Direct energy conversion and energy accumulation; Durability; Effects; Electric properties; Electrical engineering. Electrical power engineering; Electrical power engineering; Electronics; Energy; Exact sciences and technology; Glass; Mass spectrometry; Modification; Natural energy; Optoelectronic devices; Photoelectric conversion; Photovoltaic conversion; Photovoltaic glass; Polymer films; Polysiloxane; Semiconductor doping; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Solar cells. Photoelectrochemical cells; Solar energy; Solid solutions; Modification; Durability; Polysiloxane; Photovoltaic glass; Abrasion-resistance; Antireflective coating; Performance evaluation; Atomic force microscopy; Particle size; Nanoparticle; Doping; Refraction index; Outdoor installation; Glass; Porous material; Photovoltaic cell; Visible radiation; Antireflection coating; Siloxane polymer; Scanning electron microscopy; Doped materials; Layer thickness; Transmittance; Abrasion resistance; Silicon oxides; Sol gel process; Morphology; Porosity
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/j.solener.2012.08.020

► A novel antireflective film with good durability was prepared by sol–gel process. ► Effects of different polysiloxane doping ratio on film’s performance were studied. ► Transmittance and reflective spectra was tested by spectrophotometer. ► Abrasion-resistance of films derived from different sols was compared. ► Modified base catalyzed sol with 5% doping ratio exhibits optimal properties. Antireflective coatings with high transmittance and excellent durability were prepared by sol–gel process using tetraethyl orthosilicate as precursor. The base-catalyzed sol was modified by acid-catalyzed polysiloxane, and the effects of different doping ratio on the performance of films were studied. The properties including distribution of sol particles, UV–Vis absorbance, refractive index, film thickness and morphology were characterized by nano-particle size analyzer, spectrophotometer, ellipsometer, atomic force microscope (AFM), scanning electron microscopy (SEM) respectively. The results showed that the particle size in sols grew bigger, porosity of films was reduced, refractive index increased and undesirable decrease of the transmittance appeared with the increase of doped polysiloxane. Refractive index could be adjusted from 1.23 to 1.42 continuously by changing the doping ratio. Although the visible light transmittance of the film declined from 97.81% to 94.24% quickly when the doping ratio increased from 0% to 16%, the transmittance attenuation after outdoor exposure for 90days reduced from 2.70% to 0.22% successfully, and the abrasive-resistance properties of the silica films improved remarkably. Take all factors into consideration, modified base catalyzed sol with 5vol% doping ratio exhibits excellent properties including high transmittance, good durability and high abrasion-resistance.