Series of New D-A-蟺-A Organic Broadly Absorbing Sensitizers Containing Isoindigo Unit for Highly Efficient Dye-Sensitized Solar Cells

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• 作者：Weijiang Ying ; Fuling Guo ; Jing Li ; Qiong Zhang ; Wenjun Wu ; He Tian ; Jianli Hua
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：August 22, 2012
• 年：2012
• 卷：4
• 期：8
• 页码：4215-4224
• 全文大小：510K
• 年卷期：v.4,no.8(August 22, 2012)
• ISSN：1944-8252

文摘

In this work, six new D-A-蟺-A sensitizers (ID1鈥?b>ID6), with triarylamine as the electron donor; isoindigo as a auxiliary electron withdrawing unit; thiophene, furan, and benzene as the linker; and cyanoacrylic acid as the anchoring group, were synthesized through simple synthetic procedures and with low cost. Their absorption spectra were broad with long wavelength absorption maximum approximately at 589 nm and the absorption onset at 720 nm on the TiO₂ film. Electrochemical experiments indicate that the HOMO and LUMO energy levels can be conveniently tuned by alternating the donor moiety and the linker. All of these dyes performed as sensitizers for the DSSCs test under AM 1.5 similar experimental conditions, and a maximum overall conversion efficiency of 5.98% (J_sc = 14.77 mA cm^鈥?, V_oc = 644 mV, ff = 0.63) is obtained for ID6-based DSSCs when TiO₂ films were first immersed for 6 h in 20 mM CDCA ethanol solution followed by 12 h of dipping in the dye CH₂Cl₂ solution. Electrochemical impedance measurement data implies that the electron lifetime can be increased by coadsorption of CDCA, which leads to a lower rate of charge recombination and thus improved V_oc.

Keywords:

isoindigo; D-A-蟺-A; broad absorption; chenodeoxycholic acid; solar cells; triarylamine