2-Step self-assembly method to fabricate broadband omnidirectional antireflection coating in large scale

• Published in: Solar energy materials and solar cells 2011-02, Vol.95 (2), p.699-703
• Main Authors: Yeung, K.M., Luk, W.C., Tam, K.C., Kwong, C.Y., Tsai, M.A., Kuo, H.C., Ng, A.M.C., Djurišić, A.B.
• Format: Article
• Language: English
• Subjects: Antireflection; Applied sciences; Broadband; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electronics; Energy; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Nano silica; Natural energy; Omnidirectional; Optical coatings; Optical elements, devices, and systems; Optics; Optoelectronic devices; Photoelectric conversion; Photovoltaic conversion; Physics; Self-assembly; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Solar cells. Photoelectrochemical cells; Solar energy
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2010.10.005

We have developed a simple and reproducible 2-step self-assembly method for the fabrication of broadband, omnidirectional antireflection coating on glass substrate with 4 in. size. The glass surface has been modified to be positively charged, then the negatively charged nano silica is self-assembled to the glass substrate by electrostatic attraction. The nanostructure on the glass substrate reduces the reflection significantly, which results in enhanced transmittance. Transmittance as high as 97.7% at 499 nm has been obtained for a double-side coated glass substrate. Obvious reduction in weighted reflectance is still observed up to 60° incident angle.