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標題: 開發具高穿透、光自潔功能之光學薄膜
Investigation of the nanocoating with high transmittance and self-cleaning
作者: Yu-Xuan Huang
關鍵字: 抗反射;自潔性;親水性;二氧化鈦;二氧化矽;微波水熱法;薄膜太陽能電池;Anti-reflecting;self-cleaning;hydrophilic;titanium dioxide;silicon dioxide;microwave hydrothermal synthesis;thin film solar cells.
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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.
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