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Magnetic Field Effects in Organic Semiconductor Devices in High Magnetic Fields

TYPESolid State Institute Seminar
Speaker:Mr. Daniel Nikiforov
Affiliation:Department of Physics and the Solid State Institute, Technion
Time:12:30 - 13:30
Remark:M.Sc. student of Prof. Eitan Ehrenfruend
Abstract:We report on magnetic field effects in organic light emitting diodes made of homopolymer active layers in magnetic fields up to 8 T. The measurements on bias driven devices include magneto-condoctance and magneto-electroluminescence. We also studied magneto-photoconductance and magnetophotoluminescence in optically excited devices. In the very low magnetic field regime (B<~10 mT) we find that the main mechanism responsible for the magneto-effects is the hyperfine interaction between the charge carriers and protons. The high field response is dominated by the anisotropic g-tensor and thermal spin polarization. We developed a simplified quantum mechanical approach taking into the above interactions in order to account for the experimental data.