研究生: |
李庭輝 Lee, Ting-Hui |
---|---|
論文名稱: |
含dithiafulvalene單元之二聚體式光敏染料及其在染敏太陽能電池上之應用 Dithiafulvalene-based dimer-type sensitizers for DSSCs application |
指導教授: |
林建村
Lin, Jiann-T'Suen |
學位類別: |
碩士 Master |
系所名稱: |
化學系 Department of Chemistry |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 114 |
中文關鍵詞: | 染料敏化太陽能電池 、二聚體式 |
英文關鍵詞: | dye-sensitized solar cells, dithiafulvalene, dimer-type |
論文種類: | 學術論文 |
相關次數: | 點閱:105 下載:6 |
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在本論文研究中,我們藉由Suzuki 偶合反應、Stille偶合反應、Horner-Wittig 縮合反應、Vilsmeier-Haack醛化反應以及Knoevenagel縮合反應等化學方法,合成出以dithafulvalene(DTF)單元作為電子予體(electron donor),苯環(benzene)、噻吩(thiophene)或芴(fluorene)作為共軛架橋(spacer),以及以2-cyanoacrylic acid作為電子受體(electron acceptor)所組成的一系列單體式染料M1、M2和M4,以及二聚體式染料D2–D5。
藉由循環伏安法(Cyclic voltammetry)、差式脈衝伏安法(Differential Pulse Voltammetry)以及可見-紫外光光譜儀(UV-Vis absorption spectra),我們可以測得化合物在溶液狀態下的HOMO及LUMO能階,以及分子的光收成的能力。我們也對這些分子進行理論計算之探討。
以此系列化合物作為染料敏化太陽能電池(dye-sensitized solar cells (DSSCs) )的光敏劑,其光電轉換效率表現介於2.11至 5.24%間。二聚體式(dimer-type)染料能夠有效的抑制染料與染料間的堆疊現象(π-π stacking),且也能夠保護TiO2光電極,降低電解質因靠近電極表面而產生暗電流(dark curent)的機會。本研究並以電化學阻抗分析(electrochemical impedance spectroscopy)來探討元件中的電子注入與電子再結合。
A series of metal-free sensitizers consist of dithafulvalene (DTF) unit as the electron donor, benzene, thiophene or fluorine moiety as the conjugated segments and 2-cyanoacrylic acid as the electron acceptor have been synthesized via Suzuki coupling, Stille coupling, Horner-Wittig condensation, Vilsmeier-Haackformylation and Knoevenagel condensation reactions. The sensitizers can be of monomer-type (M1、M2、M4) or dimer-type (D2–D5).
Cyclic voltammograms, differential pulse voltammograms and UV-Vis absorption spectra were used to estimate the HOMO and LUMO energy levels and its light harvest ability of the sensitizers in solution. Theoretical computations were also carried out on these dye molecules.
The dyes were used as the sensitizers of dye-sensitized solar cells (DSSCs). The conversion efficiencies of the DSSCs fabricated range from 2.11 to 5.24%. The dimer-type dyes can more effectively suppress the π-π stacking of the molecules and the dark current. Electrochemical impedance spectroscopy (EIS) was also used to study the electron injection and recombination behaviors.
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