Journal
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
Volume 78, Issue 2-3, Pages 135-139Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5107(00)00529-8
Keywords
sol-gel process; silica coatings; nano-porous structure; antireflectance
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A relatively new method to adjust refractive index of nano-porous silica films rapidly and continuously is reported. The thin films were prepared with the base/acid two-step catalytic sol-gel process and the dip-coating method. The structure, reflective spectra and refractive index of the films were analyzed with TEM, AFM, SEM, spectrophotometer, and ellipsometery, respectively. The experimental results have shown that the base/acid two-step catalysis can adjust the refractive index of the nano-porous silica films from 1.18 to 1.42 rapidly and continuously. And a broadband antireflective coating made with the method has very low reflectance. The average reflectance of the coated glass in the solar energy spectrum decreases to 1.5% from similar to7% of the glass. (C) 2000 Elsevier Science S.A. All rights reserved.
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