The Effect of Dopant Concentration on the Mobility of a Triphenylmethane Doped Polymer

概要

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Hole mobilities have been measured in poly(styrene) (PS) doped with bis(4-N,N-diethylamino-2-methylphenyl)(4-4-methoxyphenyl)methane (TPM). TPM is a weakly polar donor molecule with a dipole moment of 2.1 D. The results are described by a formalism based on disorder. The formalism is based on the assumption that charge transport occurs by hopping through a manifold of localized states with superimposed energetic and positional disorder. The parameters of the formalism are σ, the energy width of the hopping site manifold, Σ the degree of positional disorder, μ_0 a prefactor mobility, and ρ_0 a wavefunction decay constant. The energy widths are between 0.105 and 0.113eV, increasing with increasing TPM concentration. The concentration dependence of the widths is described by an argument based on dipolar disorder. Values of Σ are between 2.4 and 3.8, increasing with increasing dilution. The prefactor mobilities are between 1.6 × 10^<-5> and 7.4 × 10^<-2> cm^2/Vs and can be described by a wavefunctiom decay constant of 1.2 Å.
社団法人応用物理学会の論文
1996-07-15