نتایج جستجو برای: polythiophene
تعداد نتایج: 567 فیلتر نتایج به سال:
Electronic structures of undoped and doped cyclic polythiophene (PT) are studied using modified σ-bond compressibility model. Cyclic PT doped with odd number of bipolarons creates an aromatic polyene backbone containing (4n+2) π-electrons and the system is driven towards the quinoid form. Consequently, we find an insulator-metal transition for dopant concentration ≥ 14 mol % and a ∼ 0.8 eV reds...
Introduction There have been numerous investigations of the structure and organization of polythiophene films and the structural changes that occur during the thermochromic transition. The investigations have primarily focused on the behavior of these materials as pure films or in solution. However, the utilization of conjugated polymers in many electronic applications requires them to be dispe...
Conjugated polyelectrolyte (CPE) interfacial layers present a powerful way to boost the I-V characteristics of organic photovoltaics. Nevertheless, clear guidelines with respect to the structure of high-performance interlayers are still lacking. In this work, impedance spectroscopy is applied to probe the dielectric permittivity of a series of polythiophene-based CPEs. The presence of ionic pen...
Ladder-type polymers, obtained by small modifications of the atomic structure of ladder-type polythiophene, are studied using density-functional theory calculations. Within the local-density and GW approximations, it is found that upon a simple substitution of the sulfur atoms by nitrogen and boron atoms, the band structure of the resulting polymer exhibits band overlap between the occupied and...
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