It has been suggested that Poole–Frenkel behavior, i.e., the linear dependence of the log of the mobility μ on the square root of the electric-field intensity, found for many conjugated polymer films is due to the interaction between the charge carriers and randomly distributed permanent dipoles. However, the dipole concentration in the polymers is much too small to achieve this. We show that introduction of short-range correlation between the energies of the hopping sites, on the scale of the coherence length measured by x rays, can account for the field and temperature dependence of films of poly(2-methoxy,5-(2′-ethyl-hexoxy)–p-phenylene vinylene), a representative conjugated polymer. We investigate also the effects of inhomogeneity on the field and temperature dependence of μ.
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19 June 2000
Research Article|
June 19 2000
Electric-field dependence of mobility in conjugated polymer films
S. V. Rakhmanova;
S. V. Rakhmanova
Center for Photoinduced Charge Transfer, Chemistry Department, University of Rochester, Rochester, New York 14627
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E. M. Conwell
E. M. Conwell
Center for Photoinduced Charge Transfer, Chemistry Department, University of Rochester, Rochester, New York 14627
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Appl. Phys. Lett. 76, 3822–3824 (2000)
Article history
Received:
January 04 2000
Accepted:
April 20 2000
Citation
S. V. Rakhmanova, E. M. Conwell; Electric-field dependence of mobility in conjugated polymer films. Appl. Phys. Lett. 19 June 2000; 76 (25): 3822–3824. https://doi.org/10.1063/1.126793
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