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CATEGORY:
Solid State Institute Seminar
TITLE:
Magnetic Field Effects in Organic Semiconductor Devices in High Magnetic Fields
Speaker:
Mr. Daniel Nikiforov
Affiliation:
Department of Physics and the Solid State Institute, Technion
WHEN:
Wednesday
06/09/2017, 12:30 - 13:30
WHERE:
Auditorium, Solid State Institute, Technion
Organizer:
-
Site:
-
Presentation:
Event Lecture notes
Remarks:
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.
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