Giant magnetoresistance of photoconductive polymer film

Tadaaki Ikoma, Toshinari Ogiwara, Yutaka Takahashi, Kimio Akiyama, Shozo Tero-Kubota

研究成果: Paper査読


Electron spin is a subject of study that is attracting interest in the modern technology of organic electronics. It is recognized, for example, that the triplet state plays an important role in the efficient emission from electro-luminescent materials. Also, there has been a great interest in the spin effect in conductors from a view point of spintronics. Using various magnetic resonance experiments, we have studied the carrier generation mechanism of electron acceptor-doped poly(N-vinylcarbazole) (PVCz) thin films. It has been concluded that the photocarrier is generated by stepwise hole hops on a quasi-one dimensional lattice model in which the hole transfers among the nearest carbazole sites while holding the electron spin angular momentum. Based on the fact that the photoinduced geminate e-h pair plays an important role for the carrier generation, in this paper, the doping effect on the magnetoresistance of photoconductive PVCz films has been investigated. Even at room temperature, giant magnetoresistance was induced by lumichrome dopant that generated a spin-polarized triplet state through anisotropic intersystem crossing from the photoexcited singlet state.

出版ステータスPublished - 2006 12 1
イベント55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
継続期間: 2006 9 202006 9 22


Other55th Society of Polymer Science Japan Symposium on Macromolecules

ASJC Scopus subject areas

  • Engineering(all)

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