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Modelling of charge carrier transport in conjugated polymers doped by polar additives

Toman P., Nešpůrek S., Bartkowiak W.

Materials Science Poland

2009

Vol. 27, No. 3

797--812

A theoretical model of the inter-chain charge carrier transport in poly[2-methoxy-5-(2´-ethylhexyloxy)- p-phenylene vinylene] doped with a photochromic polar additive is put forward. The model attributes to each polymer chain a set of charge states, in which charge carriers thermalize. These on-chain states are calculated by solving the Schrodinger equation with a tight binding Hamiltonian. The interchain transfer rates are determined using the Marcus formula. The model describes the effect of polar additives on charge carrier transport. The presence of the additives results in a decrease of charge mobility, because of the increase of the local energy disorder. A decrease of the inter-chain mobility by up to several orders of magnitude is found if the width of the local energy disorder is doubled. This finding confirms the possibility of constructing an optoelectrical switch based on a polymer doped with a photochromic polar additive.

Towards a new horizon of optoelectronic devices with liquid crystals

Hanna J.

Opto-Electronics Review

2005

Vol. 13, No. 4

259-267

The liquid crystal having high viscosity is attracting increasing attention as a new type of quality organic semiconductor, i.e., self-organizing molecular semiconductor. In this article, its state-and-the-art in materials, properties related to charge carrier transport, and device applications, is reviewed briefly. In addition, the further researches needed towards its practical applications are discussed.