利用低壓平板火焰法成長奈米級二氧化鈦薄膜於染料敏化太陽能電池之研究

Synthesis of Nanostructured TiO2 Thin Film by Low Pressure Flat Flame Method for Dye Sensitized Solar Cell

陳怡嘉(Y. J. Chen) ； 蘇昱安(Y. A. Su) ； 蔡宜親(Y. C. Tsai)

《材料科學與工程》 38卷3期 (2006/09) Pp. 149-156

https://doi.org/10.6409/JMSE.200609.0149

摘要

本實驗中藉由改變火焰燃燒比例、前驅物溫度、生長時間及對電極施加退火等參數來控制薄膜晶相、厚度、粒徑尺寸和染料吸附量，有效地減少漏電流的產生，進而提升染料敏化太陽能電池之效率。在電極工作層方面，利用燃燒氣體比例的設定，可獲得高純度的銳鈦礦相，並且在後續的退火製程有效增加薄膜的結晶性。在顆粒形貌方面，粉末粒徑約6-8 nm，具高比表積263平方公尺/g，而高比表面積的薄膜實現大面積吸附染料之優點。薄膜厚度與外觀方面，可由沉積速率的控制，使膜厚約在10 μm左右。電池特性曲線方面，利用對晶相的退火製程改良膜厚等控制因素，提升電流密度和開路電壓。

關鍵字

平板火焰化學氣相沉積系統 ； 奈米級顆粒 ； 染料敏化太陽能電池 ； 碳原子摻雜二氧化鈦

並列摘要

In this experiment, we changed the ratio of the flame-producing acetylene/oxygen flows, precursor temperature, and growth time, to prepare the electrodes of the dye-sensitized solar cell. By the adjustment of these parameters, the leakage current of the cell is effectively reduced, promoting the efficiency of the cell. The crystal phase of the electrode can be controlled by appropriate adjustment of the ratio of the flame-producing acetylene/oxygen flows, by which pure phase of desired anatase can be prepared. Subsequent annealing of the electrode further enhances the crystallinity of the film. The film prepared are composed of particles of 6~8 nm in diameter, with the surface area as high as 263 m^2/g, which the high surface area of the film fulfill the enhancement of dye-absorption capability. By controlling the film thickness of ~10μm, cell can be prepared successfully. With the annealing the film in addition to the thickness control of the film, the short-circuit current density and open-circuit voltage of the cell are largely improved.

並列關鍵字

Flat-Flame MOCVD ； nanopowder ； Dye-Sensitized Solar Cell DSSCs ； Carbon-doped TiO2