染料敏化太陽能電池染料共軛結構對穩定度之探討

Abstract

本論文中成功的合成出此系列Donor-π-Acceptor（D-π-A）有機染料，可分為兩大類：一類為其結構中具有可自由旋轉π共軛系統結構的染料化合物，分別為AN1CA、AN2CA、AN3CA；另一類為其結構中具有ring-locked 不可自由旋轉π共軛系統結構的染料化合物，分別為ANR1CA與ANR2CA. 經由理論計算的研究得知此系列化合物皆具明顯的intramolecular charge transfer（ICT）。藉由染料化合物分別在溶劑中與吸附在二氧化鈦上時之吸收光譜、染料在二氧化鈦上的吸附量、染料莫耳消光係數、染料HOMO/LUMO能階之電化學測量、低能光電子能階（AV-2）之測量，以及染料化合物分別在溶劑中與吸附在二氧化鈦上穩定度之測量，來探討π共軛結構對穩定度及能量轉換效率之影響。 經由元件測試其能量轉換效率分別為AN1CA 3.86%（參考之N719為6.87%）、AN2CA 4.27%（參考之Z907為5.06%）、AN3CA 4.39%（參考之N719為6.27%）、ANR1CA 2.76%（參考之N719為6.87%）、ANR2CA 1.92%（參考之N719為6.87%）。

In this thesis, we successfully synthesized series of Donor-π-Acceptor (D-π-A) organic dye. They can be divided into two categories: First, their structure is free-rotating π-conjugation structures, which are AN1CA, AN2CA, AN3CA; and the second is the structure with the ring-locked π -conjugation system, which are ANR1CA and ANR2CA. By theoretical calculation of this series of structures, we can know that they show the intramolecular charge transfer (ICT). Furthermore, we discussed the differences of π–conjugation structures influencing the stability and power conversion efficiencies. And then, we got the evidences by UV-vis spectra of the dyes were dissolved in a solvent and adsorbed on titanium dioxide surface, the loading of dyes on titanium dioxide, the dyes’ molar extinction coefficient, the dyes’ HOMO / LUMO energy level of the CV and DPV measurements, the AC-2 measurements, and the stability meaurements of dyes were dissolved in a solvent and adsorbed on titanium dioxide surface. Under the device measurement, their power conversion efficiency are AN1CA 3.86% (reference to the N719 is 6.87%), AN2CA 4.27% ( reference to the Z907 is 5.06%), AN3CA 4.39% (reference N719 is 6.27%), ANR1CA 2.76% (reference to the N719 is 6.87%), ANR2CA 1.92% (reference to the N719 was 6.87%).