- A dendritic oligoarylamine-substituted benzimidazole derivative as a useful n-type dopant
-
4-(N,N-Dimethylamino)phenyl-substituted 1,3-dimethyl-2,3-dihydro-1H-benzimidazole (N-DMBI-H) has been reported as a useful solution-processable n-type dopant to control electrical conductivity over a wide range in PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) thin films. An approach for increasing the chemical stability of the DMBI-H dopant molecule in solution phase by attachment of dendritic oligoarylamine at the 2-position of the benzimidazole ring (N3-DMBI-H) has been explored in this study, and moreover the efficacy of the solution-processable n-type dopant has been clarified together with the electronic properties of N3-DMBI-H. On the basis of electrochemical, spectroelectrochemical, and quantum chemical calculations, it has been deduced that one-electron-oxidized species for N3-DMBI-H as well as N-DMBI-H are readily converted into diamagnetic cationic species by releasing a hydrogen atom.
- Uebe, Masashi,Yoshihashi, Yuji,Noda, Kei,Matsubara, Masayuki,Ito, Akihiro
-
-
Read Online
- Design, synthesis of organic sensitizers containing carbazole and triphenylamine π-bridged moiety for dye-sensitized solar cells
-
Abstract: A series of novel push–pull-based D–π–A-containing organic dyes have been synthesized using triphenylamine and carbazole act as π-conjugated donor and cyanoacrylic acid acceptor as well as anchoring group for application of dye-sensitized solar cells. These organic dyes D1, D2 and D3 exhibited excellent photophysical, electrochemical properties, superior stoke shift, high thermal stabilities and sufficient HOMO–LUMO energy levels, which is facilitated to dye regeneration and effective injection of electron from the excited state of the dyes into the conduction band (TiO2). Our results suggested that carbazole π-bridge has an important role in the photovoltaic performance. The D1 and D2 dyes are planar linear structure, longer π-conjugated bridging units, when compared to the starburst structure of D3 organic dye. Moreover, the carbazole π-bridged conjugated D1 dye showed promising photovoltaic conversion efficiency (η) of 1.4%, Voc = 735?mV, Jsc = 2.7?mA/cm2, ff = 0.73 (fill factor), when compared with the conventional N719 and D5 organic dyes.
- Velu, Sadhasivam,Muniyasamy, Harikrishnan,Ayyanar, Siva,Maniarasu, Suresh,Veerappan, Ganapathy,Sepperumal, Murugesan
-
-
Read Online
- Accumulative charge separation inspired by photosynthesis
-
Molecular systems that follow the functional principles of photosynthesis have attracted increasing attention as a method for the direct production of solar fuels. This could give a major carbon-neutral energy contribution to our future society. An outsta
- Karlsson, Susanne,Boixel, Julien,Pellegrin, Yann,Blart, Errol,Becker, Hans-Christian,Odobel, Fabrice,Hammarstroem, Leif
-
supporting information; experimental part
p. 17977 - 17979
(2011/02/28)
-