Showing papers by "Shijie Xie published in 2012"
TL;DR: In this article, the magnetoconductance effect in an organic semiconductor device based on the magnetic field related bipolaron formation was explored. But the transition between spin-parallel spin-antiparallel polaron pairs and bipolarons with a group of dynamic equations.
Abstract: We explore the magnetoconductance (MC) effect in an organic semiconductor device based on the magnetic field related bipolaron formation. We present the transition among spin-parallel spin-antiparallel polaron pairs and bipolarons with a group of dynamic equations. The transition rates are adjusted by the external magnetic field as well as the hyperfine interaction. By considering the mobility of polarons different from that of bipolarons, we obtain the MC in an organic semiconductor device. The theoretical calculation is well consistent to the experimental results. It is predicated that a maximum MC appears at a suitable branching ratio of bipolarons.
21 citations
TL;DR: In this article, the magnetoresistance (MC) effect in an organic semiconductor device based on the magnetic field related bipolaron formation was explored. But the authors did not consider the hyperfine interaction of the hydrogen nuclei.
Abstract: We explore the magnetoresistance (MC) effect in an organic semiconductor device based on the magnetic field related bipolaron formation. By establishing a group of dynamic equations, we present the transition among spin-parallel, spin-antiparallel polaron pairs and bipolarons. The transition rates are adjusted by the external magnetic field as well as the hyperfine interaction of the hydrogen nuclei. The hyperfine interaction is addressed and treated in the frame work of quantum mechanics. By supposing the different mobility of polarons from that of bipolarons, we obtain the MC in an organic semiconductor device. The theoretical calculation is well consistent to the experimental data. It is predicated that a maximum MC appears at a suitable branching ratio of bipolarons. Our investigation reveals the important role of hyperfine interaction in organic magnetic effect.
20 citations
TL;DR: In this article, a femtosecond electric pump pulse was applied to a polymer to obtain biexcitons and the relation between its yield and the photoexciting process was also presented.
5 citations