染料敏化太陽能電池劣質化分析研究

An in-situ study of dye degradation mechanism in dye-sensitized solar cell

傅思萍(Sz-Ping Fu)

指導教授 ： 楊重光

國立臺北科技大學/工程學院/化學工程研究所/碩士(2007年)

摘要

本論文主要以原位傅立葉散射–反射紅外光譜儀、多功能多角度光譜儀與拉曼散射光譜儀等儀器，觀察染料分子於TiO2膜表面之吸附機制、太陽電池元件之光電轉換效率及電池內部衰退情形。
研究中，以原位傅立葉散射–反射紅外光譜儀發現染料N3為透過兩個COOH配位基及染料N719為透過一個COOH配位基，以bidentate或者bridging形式吸附鍵結於TiO2薄膜，而染料black dye則為以一個COO-配位基以bidentate或者bridging形式吸附鍵結於TiO2薄膜。以相同染料N719在不同工作面積(1、0.49及0.25cm2)下，0.25cm2電池效率表現較1cm2，提昇51%。
透過原位傅立葉散射–反射紅外光譜儀及多功能多角度光譜儀對已吸附不同組成條件之混合染料的TiO2薄膜進行檢測，可證實於TiO2薄膜表面上確實吸附不同種之染料分子，且符合實驗設定之混合比例。
利用拉曼散射光譜儀搭配共焦(Confocal)顯微系統架構，透過其 XYZ 掃描平台，獲得2D/3D 共焦拉曼圖譜，藉由拉曼光譜可判定染料官能基是否還連接於染料分子上及其他導致劣質化的因素。

關鍵字

染料敏化太陽能電池 ； 光電轉換效率 ； 染料敏化劑

並列摘要

In the present work, the interactions between N3, N719,and black dye sensitizers with nanocrystalline TiO2 film was investigared by DRIFTs-FTIR spectroscopy. Experimental results show that N3 and N719 dyes were anchored onto the TiO2 surface by bidentate or bridging mode using two carboxylic acid groups and one carboxylic acid group, respectively. Instead, black dye uses one carboxylate group through bidentate or bridging mode. Different active areas of working electrode (1, 0.49, 0.25cm2) were immersed into the dye solution and the efficiency of solar cell is 6.21% with the active area of 0.25 cm2.
In dye co-sensitization experiment, TiO2 electrodes were mixed with N3, N719, and black dye in various proportions, results demonstrated that multiple adsorption of dyes on TiO2 surface in different extent.
In-situ Raman scanning technique were implemented under real photocurrent conditions. Valuable information on the dye intramolecular interactions in the excited state as well as the interactions between dye-semiconductor electrodes were obtained. This information were interpreted to correlate the degradation mechanisms between their operation of conditions and their corresponded material properties.

並列關鍵字

dye sensitized solar cell ； light to electron conversion efficiency ； dye Sensitized

參考文獻

Park, G. Schlichthörl, Presented at the 2nd world Conference and Exhibition

2. Neil Robertson , Angew. Chem. Int. Ed., 45, 2338 (2006)

4. Grünwald R., Tributsch H., J. Phys. Chem.B,101, 2564 (1997)

N. Vlachopoulos, M. Grätzel, J. Am. Chem. Soc., 115, 6382 (1993)

, 125, 475 (2003)