(南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 211100)
摘 要: 在氟化銨/丙三醇電解液中，采用恒壓直流陽(yáng)極氧化法制備TiO2納米管陣列，并研究其在空氣熱處理過(guò)程中的結(jié)晶行為，最后將管陣列作為光陽(yáng)極組裝成染料敏化太陽(yáng)能電池(DSSC)，研究氧化時(shí)間和熱處理溫度對(duì)其光電性能的影響。結(jié)果表明：TiO2納米管陣列的形成是一個(gè)隨時(shí)間漸進(jìn)演變的過(guò)程；隨著氧化時(shí)間的延長(zhǎng)，納米管長(zhǎng)度逐漸增大，當(dāng)時(shí)間為70 h時(shí)，長(zhǎng)度達(dá)到5 μm左右；管陣列在空氣中于400 ℃以下熱處理后，由銳鈦礦相構(gòu)成，450和500 ℃熱處理時(shí)，由銳鈦礦相和金紅石相構(gòu)成，同時(shí)管陣列結(jié)構(gòu)具有良好的高溫穩(wěn)定性。光電性能測(cè)試顯示，20 V、70 h制備的TiO2納米管陣列經(jīng)450 ℃熱處理后，組裝成的染料敏化太陽(yáng)能電池的(有效面積1 cm2)光電轉(zhuǎn)換效率可達(dá)到0.989%。
關(guān)鍵字: TiO2納米管陣列；染料敏化太陽(yáng)能電池；陽(yáng)極氧化；光電性能
（College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 211100, China）
Abstract:TiO2 nanotube arrays were fabricated by anodic oxidation in the mixture of NH4F/glycerol at a constant potential. The crystalline behavior of TiO2 nanotube arrays during heat treatment in air atmosphere was studied. Then, the dye-sensitized solar cells (DSSC) were assembled with the prepared TiO2 nanotube arrays electrodes. The effects of anodization time and heat treatment temperature on the photoelectric performances of DSSC were investigated. The results show that the formation process of TiO2 nanotube arrays is a gradual evolving process. The length of the nanotube increases obviously with increasing the anodization time. When the anodization time is 70 h, the length is about 5 μm. Only the anatase phase is found in the TiO2 nanotube arrays heat-treated at 400 ℃ or lower temperatures, while both the anatase and rutile phases are found in the tubes annealed at 450 ℃ and 500 ℃. Furthermore, the structure of TiO2 nanotube arrays has high temperature stability. Compared with other DSSC samples, the DSSC assembled with the TiO2 nanotube arrays (20 V, 70 h) annealed at 450 ℃ shows the best photoelectric performance that the light-to-electrical energy conversion efficiency is 0.989%.
Key words: TiO2 nanotube arrays; dye-sensitized solar cell; anodic oxidation; photoelectric performances
