本論文利用濺鍍法(Sputter)與電化學沈積法（Electrodeposition）將白金薄膜沉積至ITO導電基板上，並作染料敏化太陽能電池的對電極。主要目的在製備兼具高穿透度及高催化能力的白金薄膜對電極，並探討其正面與背面照光下的光電轉換效率。利用濺鍍法，當厚度為1.4nm的白金薄膜擁有最佳的催化能力且同時兼具高穿透度(波長光550nm下76%)，應用在正面及背面照光的電池效率分別為7.3%及5.9%。利用電化學法，以直流電沉積(0.1A的電流，沉積時間0.3秒)所得的白金薄膜具高穿透度特性(波長光550nm下81%)，應用在背面照光的電池效率與濺鍍法相近。以脈衝電沉積(0.1A的電流，0.1s on-time，0.3s off-time，18 cycles) 所得的白金薄膜具高催化能力特性，應用在正面照光的電池效率與濺鍍法相近。由濺鍍法與電化學沉積法製備的白金薄膜對電極，可讓背面與正面照光的電池效率比值(ηb/ηf)分別達到0.80及0.82，其值都比文獻上提及的高。這結果顯示，利用濺鍍法與電化學沉積法都可以有效提升背面照光的電池效率。

Platinum films were deposited on indium tin oxide (ITO) substrates in a sputtering process and electrodeposition process used as counter electrodes of dye-sensitized solar cells. The purpose in preparing is mainly provided with high transmittance and high catalytic activity of platinum counter electrode. By sputtering process and Pt film (1.4nm), Pt film has the best catalytic activity and the highest transmittance (76%, wavelength 550nm), and the efficiencies of front-side and back-side illumination are 7.3% and 5.9, respectively. By Electrodeposition with direct current (0.1A and 0.3s), Pt film has high transmittance (81%, wavelength 550nm). For the back-side illumination, the efficiency is closed to one by sputtering process. With pulse current (0.1A, 0.1s on-time，0.3s off-time，18 cycles) , the Pt film has higher catalytic activity. For the front-side illumination, the efficiency is closed to the one by sputtering process. Preparing Pt film by sputtering process and electrodeposition process, the ratio of the energy conversion efficiencies between back (ηb) and front (ηf) illumination, (ηb/ηf), are 0.80 and 0.82 respectively. These values are higher in comparison with those reported in the literature. This result shows the sputtering process and electrodeposition process will increase the efficiency of back-side illumination.

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