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Issue 3, 2014
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Influence of ionizing dopants on charge transport in organic semiconductors

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Abstract

Ionizing chemical dopants are widely used in organic semiconductors to enhance the charge transport properties by increasing the number of mobile charge carriers. However, together with mobile charges, chemical doping produces anion–cation pairs in the organic matrix. In this work we use experimental and computational analysis to study the influence of these ionic species on the charge transport. We show that the anion–cation pairs introduced upon doping have a detrimental, doping-level dependent effect on charge mobility. For doping levels of 0.02–0.05% molar ratio with respect to the molecular organic semiconductor, the increase in conductivity from the extra mobile charges is partially cancelled by a reduction in charge mobility from traps introduced by the anion–cation pairs. As the doping concentration increases, anion–cation pairs start to overlap, resulting in a comparatively smoother potential landscape, which increases the charge mobility to values closer to the undoped semiconductor. This result has a significant, practical impact, as it shows the need to dope at or slightly above a threshold level, which depends on the specific host-dopant combination.

Graphical abstract: Influence of ionizing dopants on charge transport in organic semiconductors

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Article information


Submitted
09 Sep 2013
Accepted
19 Nov 2013
First published
20 Nov 2013

Phys. Chem. Chem. Phys., 2014,16, 1132-1138
Article type
Paper

Influence of ionizing dopants on charge transport in organic semiconductors

A. Abate, D. R. Staff, D. J. Hollman, H. J. Snaith and A. B. Walker, Phys. Chem. Chem. Phys., 2014, 16, 1132
DOI: 10.1039/C3CP53834F

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