- Organic Dye and Dye-Sensitized Solar Cell
-
PURPOSE: An organic dye, photoelectric diode including the same and dye-sensitized solar battery are provided to have an absorbing band in long wavelength. CONSTITUTION: An organic dye is represented by chemical formula 1. A photoelectric diode includes porous oxide semiconductor membrane which includes the organic dye. A dye-sensitized solar cell comprises a first electrode, a second electrode which is formed on one side of the first electrode and includes a light absorptive layer, and electrolyte buried in a space between the first and second electrodes.
- -
-
-
- 'Donor-free' oligo(3-hexylthiophene) dyes for efficient dye-sensitized solar cells
-
The common trend in designing dyes for use in DSSCs with iodide-based electrolyte is based on a donor-π spacer-acceptor (D-π-A) architecture. Here, we report two 'donor-free' cyanoacrylic end-functionalized oligo(3-hexylthiophene) dyes (5T and 6T). Despite having no donor group, both dyes show reversible first oxidation process. Both 5T and 6T have n-hexyl alkyl chains to retard aggregation at different positions as well as different numbers of thiophene moieties. However, the dyes showed similar absorption properties and redox potentials. The DSSCs based on these dyes give power conversion efficiencies of more than 7%, although a significant difference in the VOC and FF has been observed. Using electrochemical impedance spectroscopy, this is attributed to the presence of more trap states when 6T attaches to TiO2 and modifies the surface, mainly affecting the fill factor. Overall, these dyes introduce a new and effective design concept for liquid-electrolyte DSSC sensitisers.
- Hu, Yue,Ivaturi, Aruna,Planells, Miquel,Boldrini, Chiara L.,Biroli, Alessio Orbelli,Robertson, Neil
-
p. 2509 - 2516
(2016/02/20)
-
- Conjugated polymers with repeated sequences of group 16 heterocycles synthesized through catalyst-transfer polycondensation
-
Periodic π-conjugated polymers of the group 16 heterocycles (furan, thiophene, and selenophene) were synthesized with controlled chain lengths and relatively low dispersities using catalyst-transfer polycondensation. The optical gap and redox potentials of these copolymers were fine-tuned by altering the heterocycle sequence, and atomic force microscopy revealed nanofibrillar morphologies for all the materials. Grazing incidence wide-angle X-ray scattering of the thiophene-selenophene copolymers indicated that the π-stacking distance increased with incorporation of the larger heteroatom (from ~3.7-4.0 ?), while the lamellar spacing decreased (from ~15.8-15.2 ?). The study also revealed that periodic sequences allow electronic properties to be tuned while retaining nanofibrillar morphologies similar to those observed for poly(3-hexylthiophene).
- Tsai, Chia-Hua,Fortney, Andria,Qiu, Yunyan,Gil, Roberto R.,Yaron, David,Kowalewski, Tomasz,Noonan, Kevin J. T.
-
p. 6798 - 6804
(2016/06/14)
-
- "fibonacci's route" to regioregular oligo(3-hexylthiophene)s
-
We describe a new synthetic approach to regioregular monodisperse oligo(3-alkylthiophene)s allowing for simple separation of regioregular material in gram quantities. The number of repeat units follows the Fibonacci numbers up to a length of 21. In a small adaption of this approach, introduction of a protecting group was used to synthesize an oligo(3-hexylthiophene) with 36 repeating units, the longest regioregular 3-hexylthiophene oligomer synthesized to date.
- Koch, Felix P. V.,Smith, Paul,Heeney, Martin
-
p. 13695 - 13698
(2013/10/01)
-
- Dye-functionalized head-to-tail coupled oligo(3-hexylthiophenes) - Perylene-oligothiophene dyads for photovoltaic applications
-
A series of novel donor-acceptor systems, consisting of head-to-tail coupled oligo(3-hexylthiophene)s covalently linked to perylenemonoimide, is described. These hybrid molecules, which differ by the length of the oligothiophene units from a monothiophene up to an octathiophene, were created via effective palladium-catalyzed Negishi and Suzuki cross-coupling reactions in good to excellent yields. The optical and electrochemical properties of these compounds were determined and based on this series structure-property relationships have been established which give vital information for the fabrication of photovoltaic devices. Because the synthesized perylenyl-oligothiophenes distinguish themselves by a high absorption between 300 and 550 nm and an almost complete fluorescence quenching of the perylene acceptor, they meet the requirements for organic solar cells. The Royal Society of Chemistry 2005.
- Cremer, Jens,Mena-Osteritz, Elena,Pschierer, Neil G.,Muellen, Klaus,Baeuerle, Peter
-
p. 985 - 995
(2007/10/03)
-
- Synthesis and Properties of Dihexylbithienoquinonoid Derivatives with Head-to-head, Head-to-tail, and Tail-to-tail Orientations
-
2,2′-(Dihexyl-2,2′-bithienylidene-5,5′-diylidene) bis(propanedinitrile)s (dihexylbithienoquinonoid derivatives), in which two 3-hexylthiophene moieties are connected with head-to-tail (HT) and tail-to-tail (TT) orientations, were synthesized. HT bithienoquinonoid was isolated in a single form together with a small amount of its bromo derivative, similarly to the case for the head-to-head (HH) orientational isomer. On the other hand, TT isomer exhibited a peculiar feature in solution, affording an equilibrium mixture of two geometrical isomers. Electronic and electrochemical properties of these bithienoquinonoids were studied and compared with those of HH isomer. The results proved that all these bithienoquinonoid compounds possess highly polarizable and electron-acceptable properties. HH bithienoquinonoid was reduced through one two-electron transfer process, while HT and TT isomers were reduced through two one-electron transfer processes via stable radical anions to the corresponding dianions.
- Higuchi, Hiroyuki,Yoshida, Shima,Uraki, Yoshiyuki,Ojima, Juro
-
p. 2229 - 2237
(2007/10/03)
-
- Syntheses and Properties of Unsymmetrically Substituted Bi- and Ouaterthiophenes
-
The unsymmetrically substituted bi- and quaterthiophene derivatives were synthesized. The unsymmetrically substituted bithiophenes carrying the electron-withdrawing substituent X on one of the outer thiophene rings exhibited the maxima of absorption bands at the longer wavelengths than the symmetrically disubstituted bithiophene derivatives, while the unsymmetrical quaterthiophenes had such maxima at the shorter wavelengths than the corresponding symmetrical ones. The trend of bathochromic shift of the longest wavelength absorption bands due to the electron-withdrawing substituent X was more pronounced in case of bi- or quaterthiophenes bearing push-pull substituents. The unsymmetrical quaterthiophenes exhibited the greater third-order nonlinear optical (TNLO) properties than the corresponding bithiophenes, similarly to the case between the symmetrical bi- and quaterthiophenes. However, the TNLO properties of the unsymmetrical biand quaterthiophenes showed no dependence on the electron-withdrawing strength of the substituent X, unlike those of the symmetrical ones.
- Higuchi, Hiroyuki,Uraki, Yoshiyuki,Yokota, Hiroki,Koyama, Haruki,Ojima, Juro,Wada, Tatsuo,Sasabe, Hiroyuki
-
p. 483 - 495
(2007/10/03)
-