应用TiO2光散射层於染料敏化太阳能电池工作电极之研究.doc

應用TiO2光散射層於染料敏化太陽能電池工作電極之研究 The Study of Application a TiO2 Light Scattering Layer in the Working Electrode of a Dye-Sensitized Solar Cell 研究生：劉冠宏 Liu, Kuan-Hung 指導教授：周春禧 Chou, Chuen-Shii 【摘要】 本研究為設計與製備一三明治結構之染料敏化太陽能電池，其工作電極是將FTO導電玻璃基板與染料之間，夾置光散射層與主動層的TiO2薄膜組合而成。在光散射層TiO2粉末製備部分，利用溶膠-凝膠法實驗過程易於控制、生成之氧化物穩定等優點，經由改變退火溫度與時間，得到的不同粒徑大小與晶相的粉末。結果可得知，在固定退火溫度、不同時間及固定退火時間、不同溫度的條件下，粒徑隨著退火溫度及時間的增加而成長，同時於退火溫度800℃之後，開始有金紅石相產生。而工作電極薄膜之製備是利用旋轉塗佈法，將不同退火溫度的大粒徑TiO2粉末製備之膠體塗覆於小粒徑(P25)薄膜層上，以形成光散射層加主動層的雙層結構。由結果可得知，隨著堆疊退火溫度高的TiO2薄膜層，光散射效應也愈明顯，使得入射光能再次吸收，產生較多的光電流。由I-V電性量測結果可得知，單純P25製備之工作電極薄膜在加入光散射層後，其短路電流由13.78 mA/cm2增加至16.71 mA/cm2 關鍵字：多孔性TiO2薄膜、染料敏化太陽能電池、溶膠凝膠法、光散射層。 【Abstract】 The study designed and fabricated a sandwich TiO2 thin film electrode for a dye-sensitized solar cell which contained a light scattering layer and a active layer that was sandwiched between a FTO substrate and dye. Preparation of TiO2 particle of light scattering layer was utilized Sol-Gel method which the advantage of experiment process was easy to control and generated oxide was stable. By changed the annealing temperature and time, resulted in different particle size and crystalline powder. The result shows that different time at a fixed annealing temperature and diffenent temperature at a fixed time conditions, particle size was grew when increased annealing temperature and time . Moreover, rutile-related peaks began to appear when the annealing temperature after 800 ℃. The working electrode films were prepared by spin coating method in different annealing temperatures of big particle size TiO2 powder coated onto small diameter (P-25) thin film layers to form double layer structure. The result shows that stacked with high annealing temperature TiO2 thin film layer, light scattering effects is obvious and makes the absorption of incident light more efficiency to generate more photocurrent. The I-V electrical measuring results show that light scattering layer coated onto active layer, the short current increased