Novel tetrathiafulvalene–oligothiophene–fullerene triads have been synthesized as single-component materials for photovoltaic cells. They showed somewhat improved photovoltaic performances, when co...
Organic Dyes Incorporating the Dithieno[3,2-<i>b</i>:2′,3′-<i>d</i>]thiophene Moiety for Efficient Dye-Sensitized Solar Cells
作者:Hsiu-Yi Yang、Yung-Sheng Yen、Ying-Chan Hsu、Hsien-Hsin Chou、Jiann T. Lin
DOI:10.1021/ol902327p
日期:2010.1.1
New dipolar compounds incorporating a dithieno[3,2-b:2′,3′-d]thiophene unit as the electron donor, an oligothiophene moiety as the conjugated spacer, and 2-cyanoacrylic acid as the electron acceptor have been synthesized. These nonarylamine type metal-free organic compounds have been successfully used as the sensitizers of dye-sensitizedsolarcells (DSSCs). The conversion efficiencies of the DSSCs
合成了以二噻吩并[3,2-b:2',3'- d ]噻吩单元作为电子供体,低聚噻吩部分作为共轭间隔基和2-氰基丙烯酸作为电子受体的新型偶极化合物。这些非芳基胺型无金属有机化合物已成功用作染料敏化太阳能电池(DSSC)的敏化剂。在AM 1.5 G辐照下,DSSC的转化效率范围为3.54至5.15%。在相似条件下制造和测量的钌染料基于N719的标准电池的最佳效率约为70%。
Synthesis and Photophysical Properties of Two Dual Oligothiophene-Fullerene Linkage Molecules as Photoinduced Long-Distance Charge Separation Systems
作者:Masashi Narutaki、Kazuo Takimiya、Tetsuo Otsubo、Yutaka Harima、Huimin Zhang、Yasuyuki Araki、Osamu Ito
DOI:10.1021/jo051821v
日期:2006.3.1
To further extend photoinduced charge separation previously observed for olio-othiophene-fullerene dyads (nT-C-60), we have studied two novel dual oligothiophene-fullerene triads, 8T-4T-C-60 and 4T-8T-C-60, where quaterthiophene (4T) and octithiophene (8T) are linked by a trimethylene chain and either one is attached to a fullerene (C-60). The cyclic voltanirnograrns and electronic absorption spectra of these triad compounds indicated no electronic interactions among, the three components. On the other hand, the emission spectra were markedly perturbed by electron transfer and/or energy transfer from the oligothiophene to fullerene. Detailed comparisons between the emission spectra of the triads (8T-4T-C-60 and 4T-8T-C-60) and the dyads (4T-C-60 and 8T-C-60) suggest that the additionally attached octithiophene or quaterthiophene in the triads is involved in the photophysical decay mechanism, and the 8T-4T-C-60 triad undergoes photoinduced electron transfer leading to long-distance charge separation. This was actually corroborated by observation of the specific bands due to 8T(.+)-4T-C-60(.-) species in the transient absorption spectra after photoexcitation of the octithiophene. The sandwich device based on the 8T-4T-C-60 triad produced a more effective photovoltaic response to visible light owing to the contribution of the additional octithiophene chromophore compared to that using the dyad 4T-C-60. On the other hand, the 4T-8T-C60- based device demonstrated a rather poorer photovoltaic performance when compared to the 8T-C-60 device.
Synthesis and Photophysical Properties of Ferrocene−Oligothiophene−Fullerene Triads
作者:Hiroki Kanato、Kazuo Takimiya、Tetsuo Otsubo、Yoshio Aso、Takumi Nakamura、Yasuyuki Araki、Osamu Ito
DOI:10.1021/jo049137o
日期:2004.10.1
the involvement of intramolecular electron transfer in the photophysical decay process. The additionally conjugated ferrocene evidently contributes to the stabilization of charge separation states, thus promoting intramolecular electron transfer. This is corroborated by the observation that the emission spectra of the nonconjugated triads Fc-tm-nT-C60 are essentially similar to the corresponding dyads
Zinc–porphyrin–oligothiophene–fullerene triad, where diethynylthieno[3,4-d]imidazolium is incorporated as a central unit of oligothiophene, has been synthesized. A dramatic enhancement of fluorescence from the zinc–porphyrin unit was observed on displacing counter anion from I− to F− in the imidazolium salt, indicating that photoinduced intramolecular electron transfer is controllable by the electronic perturbation to this unit.