作者:Jianfeng Lu、Xiaobao Xu、Kun Cao、Jin Cui、Yibo Zhang、Yan Shen、Xiaobo Shi、Liangsheng Liao、Yibing Cheng、Mingkui Wang
DOI:10.1039/c3ta11870c
日期:——
In this study, new pushâpull alkoxy-wrapped zinc porphyrin dyes with intramolecular donorâÏâacceptor structures have been designed and synthesized for dye-sensitized solar cells (DSCs). The linkers based on thiophene or 2,3-dihydrothieno[3,4-b][1,4] dioxine with cyanoacetic acid can broaden the spectral response of porphyrins into the near-IR region (â¼850 nm), which is mainly attributed to the cyanoacetic acid group. However, porphyrins with cyanoacrylic acid as an anchoring group lead to a faster charge recombination rate at the dye-sensitized heterojunction interface, which lowers the device photovoltaic performance. By using porphyrins with a rigid Ï-linker feature structure that is 5-ethynylthiophene-2-carboxylic acid, highly efficient DSC devices with a power conversion efficiency of 9.5% can be obtained. Spectral, electrochemical, photovoltage transient decay and impedance measurements are performed to reveal the influence of Ï-conjugated linkers and anchoring groups upon the optoelectronic features of porphyrin dyes in DSCs.
本研究设计并合成了具有分子内供体Ïââ受体结构的新型推拉烷氧基包裹锌卟啉染料,用于染料敏化太阳能电池(DSC)。基于噻吩或 2,3-二氢噻吩并[3,4-b][1,4]二恶烷与氰基乙酸的连接体可以将卟啉的光谱响应扩大到近红外区域(§¼850 nm),这主要归功于氰基乙酸基团。然而,以氰基丙烯酸作为锚定基团的卟啉会导致染料敏化异质结界面的电荷重组速度加快,从而降低器件的光伏性能。通过使用具有 5-乙炔基噻吩-2-羧酸刚性Ï-连接体特征结构的卟啉,可以获得功率转换效率为 9.5% 的高效 DSC 器件。通过光谱、电化学、光电压瞬态衰减和阻抗测量,揭示了Ï-共轭连接体和锚定基团对 DSC 中卟啉染料光电特性的影响。