Publicação

Mesoscopic study of bipolar charge transport in polymer-based devices

Detalhes bibliográficos
Resumo:	We present generalised Monte-Carlo calculations of bipolar charge carrier transport in polydiacetylene to assess effects of some key factors on the properties of polymer-based light emitting diodes. Our mesoscopic model includes specific realisations of the polymer network and examines the effect of polymer structural order on current flow and charge recombination within the polymer layer. Specifically addressed are the issues concerning the fractions of polymer strands contributing to the charge injection processes at electrode interfaces and to electroluminescence. Our results suggest that radiative recombination increases as short chain concentration increases, whereas current efficiency shows an opposite behaviour. Radiative recombination decreases as charge injection efficiency decreases and its internal efficiency seems to saturate for a luminescent chain concentration greater than 30%. Our results also suggest that both current efficiency and space charge increases as charge injection efficiency decreases. Polymer disorder due to inclusions in the network does seem to contribute to reduce both current and recombination efficiencies.
Autores principais:	Ramos, Marta M. D.
Outros Autores:	Stoneham, A. M.
Assunto:	Mesoscopic modelling Conducting polymers Electroluminescence Conjugated polymers Conducting polymers
Ano:	2001
País:	Portugal
Tipo de documento:	artigo
Tipo de acesso:	acesso aberto
Instituição associada:	Universidade do Minho
Idioma:	inglês
Origem:	RepositóriUM - Universidade do Minho

Descrição
Resumo:	We present generalised Monte-Carlo calculations of bipolar charge carrier transport in polydiacetylene to assess effects of some key factors on the properties of polymer-based light emitting diodes. Our mesoscopic model includes specific realisations of the polymer network and examines the effect of polymer structural order on current flow and charge recombination within the polymer layer. Specifically addressed are the issues concerning the fractions of polymer strands contributing to the charge injection processes at electrode interfaces and to electroluminescence. Our results suggest that radiative recombination increases as short chain concentration increases, whereas current efficiency shows an opposite behaviour. Radiative recombination decreases as charge injection efficiency decreases and its internal efficiency seems to saturate for a luminescent chain concentration greater than 30%. Our results also suggest that both current efficiency and space charge increases as charge injection efficiency decreases. Polymer disorder due to inclusions in the network does seem to contribute to reduce both current and recombination efficiencies.