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Quantitative analysis of the guest-concentration dependence of the mobility in a disordered fluorene-arylamine host-guest system in the guest-to-guest regime

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Author: Nicolai, H.T. · Hof, A.J. · Lu, M. · Blom, P.W.M. · Vries, R.J. de · Coehoorn, R.
Type:article
Date:2011
Source:Applied Physics Letters, 20, 99
Identifier: 445729
Article number: No.: 203303
Keywords: Physics · A-density · Gaussian disorder models · Hole transports · Hopping sites · Host-guest system · Molecular density · Polyspirobifluorene · Carrier concentration · Fluorine containing polymers · Carrier mobility · Industrial Innovation · Mechatronics, Mechanics & Materials · HOL - Holst · TS - Technical Sciences

Abstract

The charge transport in a polyspirobifluorene derivative with copolymerized N,N,N',N'-tetraaryldiamino biphenyl (TAD) hole transport units is investigated as a function of the TAD content. For TAD concentrations larger than 5, guest-to-guest transport is observed. It is demonstrated that in this regime the charge carrier density dependent mobility can be described consistently with the extended Gaussian disorder model, with a density of hopping sites which is proportional to the TAD concentration and comparable to the molecular density. © 2011 American Institute of Physics.