Journal
PHYSICAL REVIEW B
Volume 62, Issue 24, Pages R16235-R16238Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.R16235
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The transport properties, namely mobility, conductivity, and charge carrier concentration of three model polymers, regioregular poly(3-hexylthiophene) (RRPHT), poly(p-phenylene vinylene) (PPV); and a polyazomethine (PAM) are investigated by charge extraction in a linearly increasing voltage. We have numerically modeled the charge carrier transients including a Gaussian distribution of localized states and the typical Poole-Frenkel-type field-dependent mobility observed in these materials, and good agreement with measured values is obtained. From our calculation we can determine the reason for the field-dependent mobility, and we found that the field-dependent release time from the localized states, tau (R) is very important in RRPHT and PPV, while PAM is governed by stochastic transport.
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