Investigation of the nanocoating with high transmittance and self-cleaning

• Main Authors: Yu-Xuan Huang, 黃宇玄
• Other Authors: Chung-Yuan Kung
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/07919986595991299026

碩士 === 國立中興大學 === 光電工程研究所 === 102 === In this thesis, titanium dioxide (TiO2) sol is prepared by microwave hydrothemal synthesis, and then mixed with silicon dioxide (SiO2) sol with different SiO2/TiO2 ratios to be sol-gel spin-coated on glass as antirereflecting and self-cleaning bifunctional layer by different annealing temperature. The results show that the optimum transmittance of the composite films is not determined only by refractive index matching at air/glass interface. Adding TiO2 into SiO2 with SiO2/TiO2=5 and annealing with 500°C leads to highest transmittance of 94.41% which is 3.92% higher than that of glass. When the annealing temperature is higher then 400°C, all the SiO2-TiO2 films show naturally remarkable hydrophilicity even without UV illumination. Furthermore, the optimized SiO2-TiO2 film applied to a-Si:H/μc-Si tandem solar cells gives rise to an increase of 0.52% in conversion efficiency. After 2-month outdoor testing, it is evaluated that cells with the SiO2-TiO2 film can avoid 1.7% degradation loss (in relative value) caused by environmental dust/ dirt.