Negative Mobility Dependence on Electric Field in Poly(3-alkylthiophene)s
Keywords:
polythiophenes, conductivity, carrier mobility, CELIV.Abstract
We have measured dependencies of conductivity and carrier mobility on the temperature and applied electric field in the
samples of regioregular poly(3-hexylthiophene) (P3HT) and poly(3-octylthiophene) (P3OT) by the Charge Extraction by
Linearly Increasing Voltage (CELIV) method. The samples were produced by the drop-casting and spin-coating
methods on the Indium-Tin-Oxide substrate and provided with Al contact at the top. We had observed the “negative”
mobility dependence at low electric fields, i.e., the mobility used to decrease with increasing electric field. To our
knowledge this is the first time, when such behaviour was confirmed by the CELIV method in P3OT samples, though it
was reported earlier by the Time-of-Flight (TOF) in other disordered materials.
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