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Magnetic field effect on photocurrent in N,N'-di(naphthalene-l-yl)-N,N'- diphenyl-benzidine (NPB)
Authors
K.W. Cheah
W.J. Chen
+3 more
M.K. Lam
B.K. Li
J.N. Wang
Publication date
1 January 2009
Publisher
Doi
Abstract
We studied organic magnetoresistance (OMAR) and magneto-photocurrent (MPC) in ITO/N,N'-di(naphthalene-l-yl)-N,N'-diplienyl-benzidine (NPB)/A1 sandwich devices with NPB thicknesses of 50 nm. Without illumination, no OMAR is observable. While the MPC curves are found to have different line shapes containing a low field and a high field component, depending on excitation photon energy and applied bias. The analysis of experimental results indicate that: (i) the magnetic field effects in NPB is associated with excitonic states, and (ii) the dissociation of singlet excitons is associated to the high field component and triplet-exciton-charge interaction is to the low field component in MPC curves. © 2009 IOP Publishing Ltd
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Last time updated on 14/05/2016