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Hence an exhaustive structural analysis has been made to have an insight on molecular geometry of thiophene oligomers. The selected bond parameters of oligomers are displayed in table 1. It is clear that, C-C BL in 2 is 1. The C-S BL in 1, is 1.

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The torsional angle of 1, range from and An in-depth understanding about the FMO of organic molecules is essential while studying the optoelectronic properties of molecules. The inclusion of two thiophene rings in 3 decreased the band gap by 0. The band gap of designed oligomer range between 1. Meanwhile LUMO of pentamer was delocalized over the whole molecule but with strong delocalization on two of the thiophene rings and acceptor groups.

The HOMO of pentamer is strongly delocalized over the two thiophene rings. In tetramer and pentamer, the HOMO and LUMO delocalization of electron is different from mono, dimer and trimer, where in 5 HOMO is delocalized on donor groups and partial delocalization over three thiophene rings is noticed.

Meanwhile, LUMO are delocalized on the acceptor groups and on three thiophene rings. This distinct feature of the oligomer 5 is attributed due to the presence of five thiophene rings. For high electron injection and improved efficiency, a molecule's LUMO should be delocalized on the acceptor group Accordingly, 1 cannot be used for optoelectronic applications, whereas 4 and 5 can be considered for making optoelectronic materials. The results of fragmentations analysis are shown in figure 4. It is important to note, that all thiophene oligomers show S 0 -S 1 electronic transitions.

It can be observed that, absorption maxima of oligomers in gas phase are significantly red shifted with respect to monomer.

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As expected monomer, absorbs at lower wavelength of nm with high excitation energy 2. This high wavelength of absorption is tagged with low excitation energy 2. Again a positive shift is observed in pentamer with respect to its counterparts. The above fact has been confirmed in pentamer which possess an intense band at nm. This higher wavelength of absorption is tagged with lowest excitation energy 2. The absorption spectrum of pentamer is observed at nm.

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Overall, these oligomers show positive solvate chromism. The dipole moment is an important property which discloses the secret about electronic charge distribution in the molecule. Extensive awareness about dipole moment of organic molecule is essential while designing the materials for optoelectronic applications.


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This has been verified, by considering trimer, in which the number of thiophene ring was increased from one to three. Trimer bears When compared with monomer, dipole moment in gas phase for trimer was increased from We use cookies to give you the best possible experience.

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NEW MOLECULES AND ORGANIC SEMICONDUCTING POLYMERS FOR OPTOELECTRONIC DEVICES

Walter Koechner. Harald Rose. Axel Donges. Ludwig Reimer. Andrew D. Kai-Erik Peiponen.


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    Horst Zimmermann. Michael Bukshtab. Mark L. Jianquan Yao. Motoichi Ohtsu. Harald H. Valerio Lucarini. Springer International Publishing, Resume : Recently, NIR polymers have been employed as an electron donor material in organic solar cells because they can harvest many more photons in the solar light.

    However, most of NIR polymer solar cells still suffer from a low fill factor FF because of inefficient charge collection. For these solar cells, the FF decreases with increasing number of fluorine atoms attached in the polymer main chain.

    Prof. Dr. Karl Leo – Future Technology Organic Electronics

    In order to discuss the origin of the lower FFs, we evaluated the bimolecular recombination rate krec by measuring transient photovoltage TPV and transient photocurrent TPC. We conclude that the bimolecular recombination should be suppressed to improve the charge collection efficiency and hence PCE of NIR polymer solar cells furthermore.

    Kawashima, T.


    1. Optoelectronics of Organic Materials;
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    5. Organic Semiconductors;

    Fukuhara, Y. Suda, Y. Suzuki, T. Koganezawa, H. Yoshida, H. Ohkita, I.

    follow link Osaka, K. Takimiya, J. Resume : Two-photon absorption 2PA brightness is a non-linear optical phenomenon with broad scope of applications. It has already been applied, or is under intensive investigation, in fields such as: optical limiting, polymerization-microfabrication, 3D-data storage, photodynamic therapy, two-photon excited fluorescence etc. Strategic placement of a fluorene scaffold at the periphery of a diketopyrrolopyrrole via tandem Friedel-Crafts-dehydratation reactions, resulted in dyes with supreme solubility.

    Despite the extended ring system, the dye still preserved good solubility and was further functionalized using Pd-catalyzed coupling reactions, such as Buchwald-Hartwig amination. Resume : Oligothiophenes represent an important class of compounds in the field of organic materials and have successfully been used as active components in organic solar cells OSC.

    In particular, we have recently developed a series of novel S,N-heteroacenes, which combine the stability of oligothiophenes and the planar extended pi-system of oligoacenes. By multiple fusions of thiophene and pyrrole rings, a full series up to a mer has been synthesized leading to a novel class of conjugated materials with highly interesting optoelectronic properties. The small bond length alternation, planarity, optoelectronic, and good charge transport properties 3 qualify the S,N-heteroacenes for application in organic electronics, in particular for highly efficient organic 4 and hybrid perovskite solar cells.

    Wetzel, E. Brier, A.

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    Vogt, A. Mishra, E. Mena-Osteritz, P.