| 研究生: |
曾山智美 Shan, Chih-Mei Tseng |
|---|---|
| 論文名稱: |
擬固態鈷系統電解質的製備及其在染料敏化太陽能電池的應用 Preparation of Cobalt-Based Quasi-Solid State Electrolytes for Dye-Sensitized Solar Cell Applications |
| 指導教授: |
李玉郎
Lee, Yuh-Lang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2019 |
| 畢業學年度: | 107 |
| 語文別: | 中文 |
| 論文頁數: | 114 |
| 中文關鍵詞: | 染料敏化太陽能電池 、鈷錯合物氧化還原對 、膠態電解質 、印刷式製程 |
| 外文關鍵詞: | Dye-sensitized solar cells, cobalt complex redox couple, quasi-solid state electrolyte, Printing process |
| 相關次數: | 點閱:105 下載:0 |
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本研究利用鈷錯合物作為氧化還原對,藉由調控不同高分子組成來製備灌注式與印刷式擬固態電解質,並應用於染料敏化太陽能電池(DSSC)。首先,灌注式電解質的製備是以不同比例的聚偏二氟乙烯-三氯乙烯(PVDF-HFP)與聚甲基丙烯酸甲酯(PMMA)共混來作為膠化劑。實驗結果顯示,與液態電解質相比,膠態電解質之使用會顯著降低元件於太陽光照射下的轉換效率;然而,在室內螢光燈(照度200 lux)照射下,當PVDF-HFP/PMMA之比例為9/1時,膠態元件可達到比液態元件更佳的光電轉換效率20.60%。由FTIR結果得知,在高分子共混系統中,PVDF-HFP與PMMA兩分子間的氫鍵可使電解質混合更加均勻,有利於電荷於電解質中的傳輸。另外,膠態元件於常溫下經過1000小時後仍可維持100%之初使效率,呈現出良好的穩定性。進一步將此灌注式電解質用於組裝可雙面照光之DSSC,當室內光分別由光電極(正向)與對電極(背向)入射至元件時,光電轉換效率可分別達到19.29%與16.89%。
在印刷式電解質的探討上,本研究主要以聚乙二醇(PEO)作為增稠劑來調控電解質的黏度。結果顯示,在加入9 wt.% PEO之後,電解質可呈現適合印刷製程之流變行為;此外,相較於其它PEO添加量,在9 wt.%時,相關元件可量測到最大的電荷再結合阻力,因此可在室內光環境中達到最佳的光電轉換效率20.47%,此元件於常溫中亦呈現極佳的穩定性。進一步將此印刷式電解質應用至可雙面照光之DSSC,於正向與背向照光下,光電轉換效率可分別達到17.22%與14.25%。
In this study, quasi-solid state electrolytes containing cobalt complex redox couples were prepared by adding polymers. There were two kinds of quasi-solid state electrolytes, One was injection gel electrolyte and the other was printable gel electrolyte. In injection gel electrolytes, added PVDF-HFP and PMMA simultaneously into electrolytes and adjusted the ratio of PVDF-HFP/PMMA. In the result, comparing with liquid electrolyte, the gel electrolyte would decrease the power conversion efficiency (PCE) significantly under standard 1 sun irradiation (100 mW/cm2). However, the PCE of gel device could achieve 20.6% when the PVDF-HFP/PMMA ratio was 9/1 under 200-lux fluorescent lighting, which was higher than liquid device. According to the FTIR results, in the polymer blending system, the hydrogen bond between PVDF-HFP and PMMA could make the electrolyte be mixed well, thereby improving the charge transfer. In addition, the stability of gel devices could maintain almost 100% of their initial value for 1000 hours at room temperature. Furthermore, DSSCs for bifacial applications were assembled and investigated in this study. In the fluorescent lighting environment, the PCE of bifacial DSSC with 4 layers TiO2 under front-side and back-side illumination were 19.29% and 16.89%, respectively.
In printable gel electrolytes, added PEO as viscous agent into the electrolyte to regulate the viscosity of electrolyte. The results show that the electrolyte exhibited rheological behavior suitable for the printing process by adding 9 wt.% PEO. Moreover, compared with other printing devices, the device with 9 wt.% PEO had the higher resistance of recombination (Rct), leading to an optimal PCE of 20.47% under 200 lux illumination. In stability test, the DSSC with 9 wt.% PEO also exhibited excellent stability at room temperature. Further, the printable electrolyte was applied to bifacial DSSC, the PCE of DSSC with 4 layers TiO2 under front-side and back-side illumination were 17.22% and 14.25%, respectively.
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