染料敏化太陽能電池具有可撓曲、透明度高、色彩鮮明且製作成本低廉等優點而備受矚目。電池元件中陽極所使用的半導體材料TiO2，利用其表面的-OH官能基和染料分子鍵結，使染料吸附在TiO2上。所產生的光電子再經由TiO2以擴散的方式傳遞至外線路。本研究重點為合成不同粒徑大小的TiO2奈米粒子H-T1和H-T5，並摻雜入ZnO這一個具有較高電子傳導速度的半導體，所製作的電極能吸附更多染料，並降低電池元件的電阻，進而產生較大的光電流。本論文同時針對本實驗室所合成的一系列有機染料，尋找最佳的TiO2 電極製造條件。此外，由於有機染料的共軛結構，容易因分子間的 π- π interaction而有聚集的現象，因此藉由不同量之共吸附劑DCA 、Cheno的添加，來提高電池元件的效能，如在F-DOT1溶液中添加15 mM的Cheno能夠大幅的改善電池元件的光電轉換效率由2.5 %增加為5.7 %。 Great attention has been devoted to the solar energy conversion by dye-sensitized solar cell（DSSC）due to its advantages of flexible, transparent, colorful, light weight and low fabrication cost compared to the conventional p-n junction silicon solar cell. The anode of the DSSC was generally made with a wide band-gap semiconductor TiO2 deposited onto a transparent conducting oxide. The electrons in dye molecules adsorbed on TiO2 nanoporous film were excited and then inject into TiO2 conduction band to generate the photocurrent by sun light illuminating. The objective of this study is focus on the preparation of TiO2 electrode for DSSC by controlling the TiO2 particle size, additive and anode architecture, especially for organic sensitized DSSC. Furthermore, organic dye was generally designed as a donor-πconjugation bridge -acceptor structure. The conjugated bridge causes the aggregation of the dyes because of their π- πinteraction. In this study, two co-adsorbents DCA and Cheno were added separately into the dye solution to avoid the dye aggregation and suppress the electron recombination between the electron in TiO2 and I3- ion in the electrolyte. We found that by adding 15 mM Cheno in the F-DOT1 dye solution, the photo to current conversion efficiency can increase from 2.5 % to 5.7 %.
