含[3,4-b]雙噻吩單元之染料及其在染敏太陽能電池之應用

Thieno[3,4-b]thiophene-Based Organic Dye for Dye-Sensitized Solar Cells

蔡明志(ming-chih Tsai)

指導教授 ： 姚清發 ； 林建村

國立臺灣師範大學/理學院/化學系/碩士(2011年)

摘要

本論文利用Stille coupling、Buchwald-Hartwig coupling與Knoevenagel condensation等反應，合成出一系列非金屬系有機光敏染料（metal-free organic dyes）。此系列染料以arylamine作為電子予體（donor），2-cyanoacrylic acid為電子受體（acceptor），並以噻吩香稠環(thieno[3,4-b]thiophene)為共軛架橋（spacer）並引入呋喃（furan）、噻吩（thiophene）等芳香雜環所組成。
此系列染料藉由引入低能帶片段以利吸收波長（λabs）座落在較長的波段，這些化合物之電荷轉移吸收的確出現於477−553 nm之間。經電化學與吸收光譜量測推算出此系列染料之HOMO與LUMO能階範圍分別約在5.23−5.48與3.14−3.37 eV之間，因此染料皆可以順利將電子注入TiO2光導電極以及隨後藉由電解質還原而。以這些染料組裝成的染料敏化太陽能電池（dye-sensitized solar cells, DSSCs）的光電轉換效率為1.23−5.31%。在相同條件下和N719染料製成的標準元件比較，可達標準元件效率的17−72%。

關鍵字

染敏太陽能電池 ； 雙噻吩單元

並列摘要

A novel series of metal-free organic dyes were synthesized via Stille coupling, Buchwald-Hartwig coupling and Knoevenagel condensation. These dyes are composed of an arylamine moiety as the electron donor, a conjugated spacer containing ethyl thieno[3,4-b]thiophene-2-carboxylate, and furan (or thiophene) as the electron transmitting bridge, and an 2-cyanoacrylic acid as the electron acceptor and anchoring group to the TiO2 surface.
The lowbandgap thieno[3,4-b]thiophene entity was incorporated in the conjugated spacer of the sensitizer for red shifting the absorption band. Indeed, the charge-transfer absorption maximum of the sensitizer ranges from 477 to 553 nm. Cyclic voltammograms and absorption spectra were used to calculate the HOMO and LUMO energy levels of these dyes, The HOMO and LUMO energies fall in the range of 5.23−5.48 and 3.14−3.37 eV, respectively, which facilitate both electron injection to TiO2 and subsequent dye regeneration. Dye-sensitized solar cells (DSSCs) using these dyes exhibit high solar energy-to-electricity conversion efficiencies ranging from 1.23% to 5.31%, which reach 17−72% of the standard device of N719 fabricated and measured under the same conditions.

並列關鍵字

Dye-Sensitized Solar Cells ； Thieno[3,4-b]thiophene

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