Supramolecular self-assembly of small organic molecules has emerged as a powerful tool to construct well-defined micro- and nanoarchitecture through fine-tuning a range of intermolecular interactions. The size, shape, and optical properties of these nanostructures largely depend on the specific assembly of the molecular building units, temperature and polarity of the medium, and external stimuli. The
shape and aggregation of donor–π–acceptor (D–π–A) organic dyes is of great significance for realizing the principle of maximizing the performance of dye-sensitizedsolarcells (DSCs). To this end, two dithiafulvene-based organic sensitizers with different molecular shapes were synthesized, and the influence of their aggregation on TiO2 on the various performance parameters of DSCs was investigated. It was
供体-π-受体(D-π-A)有机染料的分子形状与聚集之间的良好匹配关系对于实现最大化染料敏化太阳能电池(DSC)性能的原理具有重要意义。为此,合成了两种分子形状不同的二硫富富烯类有机增感剂,研究了它们的聚集对TiO 2的影响。发现在分子结构中供体和受体之间的扩口角为150.6°的V形DTF-C5倾向于在TiO 2的表面上形成致密的聚集体,而不会损失吸附的染料,从而得到更高的短路密度(J sc)为14.92 mA cm -2,功率转换效率(PCE)为7.39%;这些值分别比具有CDCA共吸附剂的DSC高1.48倍和1.53倍。另一方面,DTF-C6具有典型的V型构型,耀斑角为120.6°,需要与CDCA共同吸附以填充TiO 2表面染料聚集体之间的空位,目的是:减少电流损耗并抑制电子复合。相比于用原始的DSC DTF-C6聚合,基于共吸附系统上的示例显着提高了PCE从5.50%至9.04%,由于该改进的Ĵ
Dye-Sensitized Solar Cells Based on (Donor-π-Acceptor)<sub>2</sub>Dyes With Dithiafulvalene as the Donor
作者:Ting-Hui Lee、Chih-Yu Hsu、You-Ya Liao、Hsien-Hsin Chou、Heather Hughes、Jiann T. Lin
DOI:10.1002/asia.201402232
日期:2014.7
Dipolar metal‐free sensitizers (D‐π‐A; D=donor, π=conjugatedbridge, A=acceptor) consisting of a dithiafulvalene (DTF) unit as the electron donor, a benzene, thiophene, or fluorene moiety as the conjugated spacer, and 2‐cyanoacrylic acid as the electron acceptor have been synthesized. Dimeric congeners of these dyes, (D‐π‐A)2, were also synthesized through iodine‐induced dimerization of an appropriate
无偶极金属敏化剂(D-π-A; D =供体,π=共轭桥,A =受体),由作为电子供体的二硫富瓦烯(DTF)单元,作为共轭间隔基的苯,噻吩或芴部分组成,并且已经合成了2-氰基丙烯酸作为电子受体。这些染料的二聚体同类物(D-π-A)2也通过碘诱导的适当DTF片段的二聚而合成。使用新型染料作为敏化剂的染料敏化太阳能电池(DSSC)的电池效率范围为2.11%至5.24%。(D-π-A)2染料除了可以更好地收集光以外,还可以比D-π-A染料更有效地抑制暗电流。
Dithiafulvenyl Unit as a New Donor for High-Efficiency Dye-Sensitized Solar Cells: Synthesis and Demonstration of a Family of Metal-Free Organic Sensitizers
作者:Kunpeng Guo、Keyou Yan、Xiaoqing Lu、Yongcai Qiu、Zhike Liu、Jianwei Sun、Feng Yan、Wenyue Guo、Shihe Yang
DOI:10.1021/ol300477b
日期:2012.5.4
This work identifies the dithiafulvenyl unit as an excellent electron donor for constructing D−π–A-type metal-freeorganicsensitizers of dye-sensitizedsolarcells (DSCs). Synthesized and tested are three sensitizers all with this donor and a cyanoacrylic acid acceptor but differing in the phenyl (DTF-C1), biphenyl (DTF-C2), and phenyl–thiopheneyl–phenyl π-bridges (DTF-C3). Devices based on these
Alkyl-substituted bis(4-((9<i>H</i>-fluoren-9-ylidene)methyl)phenyl)thiophenes: weakening of intermolecular interactions and additive-assisted crystallization
作者:Alina A. Sonina、Christina S. Becker、Anatoly D. Kuimov、Inna K. Shundrina、Vladislav Yu. Komarov、Maxim S. Kazantsev
DOI:10.1039/d0ce01794a
日期:——
solution and a PL QY of 5% for C2-BFMPT and 2% for C8-BFMPT (form II) crystals was demonstrated. The cooling of the C8-BFMPT form II resulted in 10-fold increase of PL QY. The introduction of alkyl-substituents and additive-assisted crystallization are highlighted as powerful tools for the control of crystal packing, morphology, polymorphism and the optical performance of AIE-materials.