新穎非對稱鋅酞青素之合成與鑑定及其在染料敏化太陽能電池之應用

Abstract

鋅酞青素常被使用於染料敏化太陽能電池，因為它能吸收近紅外光及紅光波段之太陽光以及具有良好光及化學穩定性。我們成功合成三種鋅酞青素染料35TN、TThC與TThCA。並分別用核磁共振光譜儀(NMR)、質譜儀鑑定化合物之結構；並由紫外/可見光光譜儀及循環電位儀了解化合物之HOMO、LUMO與吸收光譜；低能量表面功函數量測儀(AC-2)得知化合物在固態時之能階；理論計算模擬化合物在激發態時墊子躍遷的情形；更進一步將染料製作染敏太陽能電池探討其光電轉換效率，結果將與TT1、TT7與35T比較。 在模擬太陽光AM 1.5 (100 mW/cm2) 照射下，利用浸泡式與液滴式的方式製作太陽能電池元件，其酞青素染料分子的光電轉換效率浸泡式分別為TT1 (3.24 %)、TT7 (1.26 %)、TThC (1.34 %)、TThCA (2.13 %)、35T (1.12 %)及35TN (1.42 %)；而液滴式分別為TT1 (1.47 %)、TT7 (1.88 %)、TThC (1.73 %)、TThCA (1.33 %)、35T (0.93 %)及35TN (1.65 %)。Zinc-based phthalocyanines are attractive sensitizers for DSSCs because of their intense and long wavelength absorption and excellent photochemical and electrochemical stability. Three new zinc- phthalocyanines, 35TN, TThC and TThCA were synthesized and characterized by 1H NMR and mass spectrometry. Their HOMO and LUMO energy levels in solution and in solid state were estimated by differential pulse voltammetry, UV-visible absorption spectra, and AC-2 low energy photoelectron spectrometer, respectively. The electron distribution of molecules in excited state was investigated by density function theory calculation. Including DSSC testing, these results are compared with benchmark TT1, TT7 and 35T. Under standard global air mass (AM) 1.5, the power conversion efficiency is using dip and drop methods of fabricating solar cells, the overall power conversion efficiencies of these solar cells by dip(drop) method are 3.24 %、1.26 %、1.34 %、2.13 %、1.12 % and 1.42 % (1.47 %、1.88 %、1.73 %、1.33 %、0.93 % and 1.65 %) for phthalocyanine dyes TT1、TT7、TThC、TThCA、35T and 35TN。