尋找應用於染料敏化太陽能電池之藍色染料

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題名:	尋找應用於染料敏化太陽能電池之藍色染料
作者:	徐子閎;Hsu, Tzu-Hung
貢獻者:	化學學系
關鍵詞:	染料敏化太陽能電池;藍色染料;dye-sensitized solar cell;blue dye;benzothienoisoindigo
日期:	2017-08-17
上傳時間:	2017-10-27 12:59:43 (UTC+8)
出版者:	國立中央大學
摘要:	染料敏化太陽能電池（dye-sensitized solar cells, DSC）由於具有多色彩性、半透光性、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。而應用在染料敏化太陽能電池之藍色染料較少見。本實驗室先前合成出以benzothienoisoindigo (BTI)單元為輔助拉電子基的BTI-3、BTI-5和BTI-6皆因最大吸收波長太長，在DMSO中呈現藍綠色。本研究是以BTI-3作為基本結構出發，將BTI單元中的Thiophene由靠近於推電子基改為靠近於拉電子基，設計出BTI-4，使其最大吸收波長藍位移。再來以BTI-3及BTI-5作為基本結構，分別在推電子基及輔助拉電子基（Aa）中間插入一個苯環，合成出BTI-7及BTI-13，藉由染料的平面性下降而使最大吸收波長藍位移。再以BTI-13為基本結構，將推電子基換成正己基或溴基，設計出BTI-15和BTI-17，利用較弱的推電子基及降低染料分子的共軛長度，使染料之最大吸收波長藍位移。結果顯示BTI-4在DMSO中之最大吸收波長比BTI-3短，呈現較接近藍色的藍綠色。BTI-7和BTI-13的最大吸收波長都比相對的BTI-3及BTI-5的短，在DMSO中也都呈現藍綠色，但比BTI-3及BTI-5更接近藍色。BTI-15及BTI-17在DMSO中的顏色比BTI-13更接近藍色，其中含最弱推電子基的BTI-17呈現深藍色。而將染料吸附在TiO2後，因其最大吸收波長產生藍位移，BTI-4與BTI-7呈現綠色，BTI-13、BTI-15與BTI-17之元件呈現紅色。雖然BTI系列染料的LUMO能階都不高，但可透過電解質優化，使TiO2的導帶能階下降，提高染料受光激發的電子注入至TiO2導帶能階的驅動力。其中，有最高莫耳吸收係數乘以染料吸附量和吸附在TiO2有高覆蓋度的BTI-13所組裝之元件有最高的光電轉換效率達4.41%。;Dye-sensitized solar cell (DSC) is a hot research topic because of its multicoloured, semi-transparent, flexible and low cost. A lot of studies are related to find new sensitizers nevertheless blue dye is relatively rare. In this thesis, we focus on the synthesis of blue dyes for DSC. Our previous study showed that BTI-3, BTI-5 and BTI-6 with benzothienoisoindigo (BTI) unit as an auxiliary acceptor (Aa) are blue-green in DMSO due to their λmax values are too long. To blue-shift the λmax of the dyes, BTI-4 is design by changing the position of acceptor part to be connected to the thiophene of BTI unit instead of connecting to the benzene. The λmax value of BTI-4 is smaller than that of BTI-3, but still in blue-green when dissolved in DMSO. BTI-7 and BTI-13 are prepared by inserting an additional phenyl unit between donor and Aa of BTI-3 and BTI-5, respectively. The λmax values of both BTI-7 and BTI-13 are smaller than those of BTI-3 and BTI-5. However, the color of BTI-7 and BTI-13 in DMSO is still blue-green. Finally we prepared BTI-15 and BTI-17 by using n-hexyl and bromide as donor instead of fluorene, respectively. The λmax value of BTI-15 is blue-shifted in DMSO but the color is still blue-green, nevertheless BTI-17 in DMSO is blue. BTI-4 and BTI-7 adsorbed on TiO2 film is green, BTI-13, BTI-15, and BTI-17 adsorbed on TiO2 film is red. These five dyes were used as sensitizers for DSC, BTI-13 has the highest conversion efficiency of 4.41%, due to its high molar absorption coefficient and large dye loading which leads to high surface coverage of when adsorbed on TiO2 film.
顯示於類別:	[化學研究所] 博碩士論文

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