Topic
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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TL;DR: In this paper, the authors present a calculation of bipolaron stability in doped conjugated polymers which emphasizes the role of the dopants as tunneling bridges between neighboring chains.
Abstract: We present a calculation of bipolaron stability in doped conjugated polymers which emphasizes the role of the dopants as tunneling bridges between neighboring chains.
30 citations
TL;DR: In this article, it was shown that only spin polarons are responsible for the current spin polarization in a ferromagnetic (FM)/organic system, and the effects of the conductivity matching and the interfacial resistances on spin polarization were discussed.
Abstract: Instead of spin electrons or holes, the carriers in polymers are supposed to be spin polarons or spinless bipolarons. Based on the spin diffusion theory and Ohm's law, we studied spin-polarized injection into organic polymers. It was obtained that only spin polarons are responsible for the current spin polarization in a ferromagnetic (FM)/organic system. Effects of the conductivity matching and the interfacial resistances on the current spin polarization were discussed.
30 citations
TL;DR: Photoinduced defects in the bromide-bridged platinum linear chain yield Raman, absorption, and electron paramagnetic resonance (EPR) signals that are examined as a function of temperature to determine the kinetics of the decay of these metastable defects in an interdmediate-strength low-dimensional charge-density-wave (CDW) solid.
Abstract: Photoinduced defects in the bromide-bridged platinum linear chain (Pt(en){sub 2})(Pt(en){sub 2}Br{sub 2})(ClO{sub 4}){sub 4} (PtBr, where en=ethylenediamine) yield Raman, absorption, and electron paramagnetic resonance (EPR) signals that have been examined as a function of temperature in order to determine the kinetics of the decay of these metastable defects in an intermediate-strength low-dimensional charge-density-wave (CDW) solid Both diamagnetic and paramagnetic defects are photogenerated with the initial excitonic transient primarily decaying to form electron bipolarons and hole polarons The photogenerated Raman signal is indicative of the former and the EPR signal of the latter The type and stability of these photoinduced defects are dependent on the sample history, with PtBr crystals grown in the orthorhombic phase (above 30 {degree}C) leading to greater variety and stability of defects as compared with those photoinduced in crystals grown in the monoclinic phase (below 10 {degree}C) The temperature dependence of the photogenerated spectroscopic signals reveals complicated decay routes, with the eventual recombination of valence defects mediated by lattice pinning potentials of various strengths, interconversion of defect states (including the possible melting'' of electron bipolarons into electron polarons) and a strengthening of the CDW as the crystals are warmed toward room temperature The observation of bromide hyperfinemore » splitting in the EPR data and the reversible intensity changes in the Raman defect signals indicates that these defects are spatially quite disperse, with ten or greater platinum sites revealed in the EPR signal, and demonstrates that the weakening of the CDW in PtBr relative to the strong CDW solid PtCl has a significant effect on the ground- and defect-state properties« less
30 citations
TL;DR: In this article, the authors present a novel approximation for finite temperatures which contains exactly both the low-density (non-degenerate) limit and the zero temperature limit, which can be expressed in terms of conventional Nernst equations describing oxidation by two one-electron steps, followed by thermodynamic equilibrium.
30 citations
TL;DR: In this article, it was shown that the oxygen vacancies cause strong carrier localization in superconducting BaPb 1− x Bi x O 3 single crystal thin films containing various amount of oxygen vacancies.
30 citations