異參茚并苯衍生物作為新型染料敏化太陽能電池染料分子之合成、性質與元件效能之研究

The Synthesis, Properties and Performance of The Isotruxene Derivatives as Novel Dye Molecules of Dye-Sensitized Solar Cell

林士勛(Shih-Hsun Lin)

指導教授 ： 楊吉水

國立臺灣大學/理學院/化學研究所/碩士(2010年)

https://doi.org/10.6342/NTU.2010.03535

摘要

在本論文中，我們探討一系列異參茚并苯衍生物ITD，ITD-Th，ITD-Hx與ITD-OM作為新型染料敏化太陽能電池染料分子之合成、性質與元件效能之研究 。
本實驗室先前曾研究異參茚并苯之光物理性質，得知異參茚并苯之不對稱性結構在吸收光譜上相較其異構物參茚并苯有更明顯紅位移之現象，具有成為太陽能電池材料之潛力。在合成部分，實驗室先前開發之合成方法其產率並不理想，且無法在特定位置進行選擇性溴化以得到合成染料分子之前驅物，因此在本論文也將介紹新開發之合成途徑。至於此系列染料分子之光物理與電化學性質部分，實驗數據顯示其吸收光譜相較以參茚并苯為核心之染料分子更能涵蓋可見光區，且電化學性質穩定，確實適合作為染料敏化太陽能電池之材料。
在元件效能方面，染料分子ITD可達到5.45％，為此系列分子之最高紀錄，且其效率較高於以參茚并苯為核心之染料分子，主要原因來自短路電流較優。此外，ITD系列分子其獨特的錐形結構可以避免電解質接近二氧化鈦電極而造成電子電洞之再結合使得效率降低，並有效提升開路電壓（Voc）除此之外，我們發現其錐形結構可能對元件效率造成影響。ITD之IPCE最高可達88％，然而此一系列染料分子卻未能涵蓋所有可見光區，此為其效率未能突破現有紀錄之原因。

關鍵字

異參茚並苯 ； 染料敏化太陽能電池

並列摘要

In this thesis, we report the synthesis and DSSC performance of four ITDs: ITD, ITD-Hx, ITD-Th, and ITD-OM.
In the previous work of our lab, several synthetic methods for isotruxene have been developed. In addition, the ortho-para vs. meta-meta pattern of truxene vs. truxene results in red-shifted absorption profile. In order to prepare iostruxene-based dyes with the donor and acceptor group in the desired positions, we have modified one of our multi-step protocols for the parent isotruxenone with milder reduction conditions to synthesize a dibromo-substituted isotruxene building block for further structure derivatization.All the target ITD dyes can be prepared directly from this building block. The red-shifted absorption profiles and stable anodic behaviors of ITDs render them promising materials for DSSC.
Our results show that these cone-shaped ITDs have high open-circuit voltages (0.67-0.76 V) and their DSSCs reached a power conversion efficiency (η) up to 5.45%, which is 80% of the ruthenium dye N719-based standard cell fabricated and measured under the same conditions. The effect of cone dimension on the DSSC performance is also discussed.
Compared to the truxene-based DSSCs, the ITD-based DSSCs show higher Jsc and η due to the broader absorption of isotruxene vs. truxene. Although the IPCE has reached 88％ at 400 nm, further improvement on the absorption profile of isotruxene derivatives could lead to superior DSSC performance.

並列關鍵字

isotruxene ； dye-sensitized solar cell

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