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Title: | 利用可撓性不銹鋼基板製作染料敏化太陽能電池 Fabrication of Dye-Sensitized Solar Cells on Flexible Stainless Steel Substrate |
Authors: | Chin-Cheng Chiang 蔣勤政 |
Advisor: | 陳奕君(I-Chun Cheng) |
Keyword: | 染料敏化太陽能電池,電子傳輸,電化學阻抗分析,可撓性, DSSC,electron transport,electrochemical impedance analyzer,flexible, |
Publication Year : | 2012 |
Degree: | 碩士 |
Abstract: | 本研究利用可撓曲基板製作染料敏化太陽能電池,其光電極中佈滿微米孔洞。 基板包括不銹鋼板、平坦化的二氧化矽阻絕層,以及用來導電的ITO,其上有一層二氧化鈦緻密層,最後具有微米孔洞的二氧化鈦光電極。而以不摻入孔洞的FTO作為光電極,其元件背面照光的效率為3.85%。我們利用摻入聚苯乙烯微米小球的二氧化鈦薄膜經過燒結所產生的微米孔洞所製作出之二氧化鈦光電極,藉以改善染料敏化太陽能電池的效能,本研究所包含的二氧化鈦光電極有兩種結構。
第一種結構採用均為相同聚苯乙烯微米小球濃度,將其摻入二氧化鈦膠體溶液,網印共三層所製作出之12 μm勻相薄膜結構光電極,在此結構下,微米的大孔洞增加了光的散射與光路徑,使染料對光的吸收機增加。此外,電化學阻抗分析與開路電壓衰減量測中顯示微米孔洞分佈在二氧化鈦薄膜中,對於電子的傳導性質與載子復合有很大的影響。使用摻雜濃度1.5 wt.% 聚苯乙烯小球所製作出的元件,其光電轉換效率為2.84 %。 第二種結構為含有三種不同濃度的聚苯乙烯小球之二氧化鈦膠體溶液製作出的非勻相薄膜結構光電極,每一層不同濃度的膜厚均為4 μm。第一層膜不摻小球、第二層膜為1.5 wt.%,而第三層膜為5 wt.%之聚苯乙烯小球所製備的二氧化鈦薄膜,其效率可達到3.41%。此種非勻相結構之染料敏化太陽能電池的效能提升除了散射效應之外,更進一步利用聚苯乙烯小球之濃度由小到大產生的光侷限效應,還有二氧化鈦薄膜可以吸收更多染料分子。 接著,我們將此最好結構的光電極用0.05M的四氯化鈦溶液浸泡,處理溫度為70oC,時間20分鐘,所組裝而成的元件其效率為3.88%。 This thesis reported the enhanced performance of flexible dye-sensitized solar cells (DSSCs) with microcavity-embedded nanoporous TiO2 photoanodes. The substrate consisted of a stainless steel foil, a SiO2 planarization and isolation layer, and an ITO contact layer. Then a TiO2 compact layer was deposited on, followed by the formation of microcavitiy-embedded nanoporous TiO2 photoanode. By using FTO glass-based photoanode without mircocavities as a reference, we obtained a cell efficiency of 3.85% under backside illumination from counter electrode. The microcavities were formed by calcining TiO2 pastes with the addition of polystyrene (PS) microspheres. The TiO2 photoanodes of this study consisted two types of structure: monolayer and trilayer. The monolayer structure was composed of three sublayers with PS microspheres of identical concentration, the composite pastes were screen printed layer-by-layer to achieve a total thickness of 12 μm (three 4-μm-thick sublayers). The present of microcavities in the TiO2 photoanode increased the light scattering and optical path, so there was more opportunity for the dye to absorb the light. Moreover, the EIS and OCVD results showed that microcavities in TiO2 had a significant impact on the electron transport propeties and the recombination time of the carriers. For DSSCs made with TiO2 paste mixed with 1.5 wt.% PS microspheres, the conversion efficiency was 2.84%, which improved by 27% from the cell made without microsphere. The trilayer structure contained three sublayers with PS microspheres of different concentrations. The I-V characteristics of the best cell was the photoanode with PS microsphere concentrations of no PS ball, 1.5 wt.% and 5 wt.% in the first, second, and third sublayers, respectively. A conversion efficiency of 3.41% was obtained. The enhancement of cell performance was due to the multiple scattering of light by the microcavities, the light confinement by the stack of TiO2 sublayers with low-to-high concentration of microcavities, and the increase of the amount of dye absorbed. Finally, the photoanode of our best structure was immersed in a 0.05M TiCl4 solution at 70oC for 20 min. The DSSC with TiCl4 treatment exhibited a coversion efficiency of 3.88%. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/63388 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 光電工程學研究所 |
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