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Bipolaron

About: Bipolaron is a research topic. Over the lifetime, 1335 publications have been published within this topic receiving 29154 citations. The topic is also known as: bipolarons.


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Journal ArticleDOI
TL;DR: In this article, the effect of γ and electron beam irradiation on conducting polymers such as polyaniline, polypyrrole, and polythiophene was investigated and it was shown that the charge-transport in low doped conducting polymer can be explained by paramagnetic polaron migration along and between the polymer chains.

75 citations

Journal ArticleDOI
Yutaka Harima1, T. Eguchi1, Kazuo Yamashita1, K Kojima1, Masaru Shiotani1 
TL;DR: In this paper, in situ ESR measurements with ClO4−-doped poly(3-methylthiophene) (PMT) are carefully performed over a wide range of doping level from 0.02% to 23% in order to correlate a drastic increase of carrier mobilities by doping with the nature of charged species in the π-conjugated polymer.

73 citations

Journal ArticleDOI
TL;DR: In this paper, an interatomic potential model for La2CuO4 has been derived, which correctly reproduce the structure of the orthorhombic phase, and yield calculated phonons dispersion curves showing a soft mode.
Abstract: Inter-atomic potential models have been derived for La2CuO4. The models correctly reproduce the structure of the orthorhombic phase, and yield calculated phonons dispersion curves showing a soft mode. Defect simulations show a large energy barrier to the Cu2+ disproportionation reaction, but find that doping of the material and oxidation of the doped material are energetically favoured. The calculations show that the latter takes place with formation of Cu3+ ions. Bipolaron formation is also investigated.

73 citations

Journal ArticleDOI
TL;DR: In this article, the authors characterized the charge carriers and band structure that evolve upon doping of electrochemically grown poly (3methylthiophene) (PMeT) films by optical absorption, infrared, and electron spin resonance measurements.
Abstract: The charge carriers and band structure that evolve upon doping of electrochemically grown poly (3‐methylthiophene) (PMeT) films are characterized as a function of film preparation conditions by optical absorption, infrared, and electron spin resonance measurements. Regardless of the solvent (acetonitrile or propylene carbonate) or dopant anion (ClO−4, PF−6, BF−4, or CF3SO−3 ) used in preparing these films, bipolarons are found to play a prominent role in the charge‐generation mechanism of PMeT at doping levels above 2 mol %. At low doping concentrations (<2 mol %), structural disorder effects in the polymer are evident. The amount of structural disorder depends on the nature of the solvent and dopant anion. The binding energy of bipolarons to dopant anions was evaluated and found to be independent of the identity of the dopant anion. Solvent‐dependent shifts in the bipolaron gap states and the binding energy are observed. These results are interpreted in terms of current theories of charge‐carrier product...

72 citations

Journal ArticleDOI
01 Nov 1988
TL;DR: The cis/trans isomerization of cis-PA upon cathodic reduction can be detected voltammetrically as discussed by the authors, showing that the trans-form is thermodynamically more favorable in the charged than in the neutral state.
Abstract: The cis/trans isomerization of cis-PA upon cathodic reduction can be detected voltammetrically. The analysis of the redox data reveals that the trans-form is thermodynamically more favourable in the charged than in the neutral state. Cyclic voltammetry also reflects geometric relaxation processes which occur in conjugated materials such as PPy or PTh during charging and discharging. The results are in good agreement with quantummechanical predictions based on the bipolaron model. Additional spectroelectrochemical studies unambiguously show that the charging process in the whole accessible potential range is faradaic.

72 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202229
202127
202023
201920
201833