尋找染料敏化太陽能電池用之藍色染料

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題名:	尋找染料敏化太陽能電池用之藍色染料
作者:	陳映維;Chen,Ying-Wei
貢獻者:	化學學系
關鍵詞:	染料敏化太陽能電池;藍色染料;DSC;Blue Dye
日期:	2016-07-29
上傳時間:	2016-10-13 17:29:34 (UTC+8)
出版者:	國立中央大學
摘要:	由於全球暖化危機，尋找好的再生能源是目前非常重要的議題，而取之不盡、用之不竭、乾淨且少污染的太陽能是目前最被看好的能源之一。染料敏化太陽能電池 (Dye-Sensitized Solar Cells, DSC)由於具有半透光性、多色彩性、可撓曲性與低製造成本等優點，是目前相當熱門的研究領域之一。本論文研究重點是設計出藍色染料，因此藉由thienoisoindigo單元作為有機染料D-Aa-π-A結構中的輔助拉電子基(Aa)，搭配推電子基triphenylamine、carbazole及fluorene，來調整染料的能隙，設計出TIID-1、TIID-3及TIID-5染料，其中TIID-1及TIID-3的donor推電子能力較TIID-5強，因此最大吸收波長較紅位移，落在紅光範圍(625~740 nm)，所以為綠色染料；TIID-5的最大吸收波長是608 nm，雖然是落在橘光範圍(590~625 nm) ，但紅光範圍仍然有強的吸收，所以染料為藍綠色；接著將不對稱結構的TIID-5染料，做反向結構得到TIID-6染料，HOMO及LUMO能階都下降，且最大吸收波長藍位移至601 nm，但在紅光範圍仍然有吸收，所以染料同樣是藍綠色；另外將TIID-5染料的固著配位基cyanoacrylic acid換成COOH，得到TIID-11染料，LUMO能階有提高且最大吸收波長藍位移至606 nm，但染料顏色仍然為藍綠色。TIID系列染料在藍光區段(440~485 nm)都有強的吸收，因此藍色不明顯，且這系列染料的LUMO能階與TiO2傳導帶能階的能階差都不足0.3 eV，因此組裝成元件後的Jsc值都不大，但是經過電解質的優化，其中有最高LUMO能階 (-0.62 vs NHE) 的TIID-1染料，有最大的光電轉換效率為3.26%。;Searching for affordable renewable energy is one of the currently important activities due to the global warming issue. Solar energy is one of the most promising renewable energy sources because it is inexhaustible, clean and less pollution. Dye-sensitized solar cells (DSC) which can convert solar energy into electrical energy, is one of the new generation solar cells under extensive studies. Dye molecules are the source for the photocurrent of DSC. They also affect the power conversion efficiency and stability of the corresponding devices. In this thesis, we focus on the synthesis of blue dyes for DSC. Thienoisoindigo unit was used as auxiliary acceptor (Aa) in a Donor-Auxiliary acceptor-π bridge-Acceptor type dye molecules. Triphenylamine, carbazole and fluorene were used as donor for tuning the molecular’s energy gap to obtain TIID-1, TIID-3 and TIID-5 dyes. Triphenylamine has stronger electron-donating ability than the other two donors, therefore TIID-1 has higher HOMO level and smaller band gap than the other two dyes. The absorption maximum of TIID-1, TIID-3 and TIID-5 are at 650, 632 and 608 nm, respectively. The absorption maximum of TIID-1 and TIID-3 falls on the wavelength of 625~740 nm, therefore are green dyes. The absorption maximum of TIID-5 is 590~625 nm, shows blue green color. TIID-6 is the inverted donor and acceptor poitions related to TIID-5, having lower HOMO and LUMO levels compared to TIID-5 with the absorption maximum blue-shifts to 601 nm. Since TIID-6 still has strong absorption at red-light range, therefore is blue green color. The cyanoacrylic acid in TIID-5 was replaced by carboxylic acid to form TIID-11. The absorption maximum of TIID-11 is 606 nm, also shows blue green. When these dyes were used as sensitizers for dye-sensitized solar cells (DSC), the maximum overall conversion efficiency of 3.26 % is achieved by TIID-1 dye. The lower photovoltaic performance of three dyes is due to the LUMO level is too low to inject the electron from the excited dye to TiO2 efficiently.
顯示於類別:	[化學研究所] 博碩士論文

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