Charge carrier mobility in poly(p-phenylenevinylene) studied by the time-of-flight technique

Lebedev, E. A.; Dittrich, Th.; Petrova‐Koch, V.; Karg, Siegfried; Brütting, Wolfgang

doi:10.1063/1.120179

Cited by 162 publications

(79 citation statements)

References 14 publications

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“…There are very few experimental results on unsubstituted PPV. A time-of-flight study by Lebedev et al 37 on unsubstituted PPV showed an Arrhenius temperature dependence, ln μ ∝ T −1 , of the mobility, while we exhibit a temperature dependence somewhere in between the Arrhenius dependence and the Bässler dependence (Eq. (9)) depending on the reorganization energy.…”

Section: Discussionmentioning

confidence: 99%

Monte Carlo simulations of charge transport in organic systems with true off-diagonal disorder

Jakobsson

Linares

Stafström

2012

The Journal of Chemical Physics

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In this work, a novel method to model off-diagonal disorder in organic materials has been developed. The off-diagonal disorder is taken directly from the geometry of the system, which includes both a distance and an orientational dependence on the constituent molecules, and does not rely on a parametric random distribution. The geometry of the system is generated by running molecular dynamics simulations on phenylene-vinylene oligomers packed into boxes. The effect of the kind of randomness generated in this way is then investigated by means of Monte Carlo simulations of the charge transport in these boxes and a comparison is made to the commonly used model of offdiagonal disorder, where only the distance dependence is accounted for. It is shown that this new refined way of treating the disorder has a significant impact on the charge transport, while still being compliant with previously published and confirmed results.

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Section: Discussionmentioning

confidence: 99%

Monte Carlo simulations of charge transport in organic systems with true off-diagonal disorder

Jakobsson

Linares

Stafström

2012

The Journal of Chemical Physics

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“…This is much higher than that measured for structurally well ordered conjugated polymers, where a of 52 meV was reported, but comparable to some molecularly doped polymer systems ͑typically in the region of 80-100 meV͒ 14 and more disordered conjugated materials, such as PPV. 20 An important parameter in the understanding of charge transport is the temperature dependence of the mobility and its effect on the shape and the scale of the photocurrent transients. The influence of temperature on the transients is shown in Fig.…”

Section: A Mobility Measurementsmentioning

confidence: 99%

Charge transport in highly efficient iridium cored electrophosphorescent dendrimers

Markham

Samuel

et al. 2004

Journal of Applied Physics

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Electrophosphorescent dendrimers are promising materials for highly efficient light-emitting diodes. They consist of a phosphorescent core onto which dendritic groups are attached. Here, we present an investigation into the optical and electronic properties of highly efficient phosphorescent dendrimers. The effect of dendrimer structure on charge transport and optical properties is studied using temperature-dependent charge-generation-layer time-of-flight measurements and current voltage (I–V) analysis. A model is used to explain trends seen in the I–V characteristics. We demonstrate that fine tuning the mobility by chemical structure is possible in these dendrimers and show that this can lead to highly efficient bilayer dendrimer light-emitting diodes with neat emissive layers. Power efficiencies of 20 lm/W were measured for devices containing a second-generation (G2) Ir(ppy)3 dendrimer with a 1,3,5-tris(2-N-phenylbenzimidazolyl)benzene electron transport layer.

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“…Transient studies of hole transport in conjugated polymers [2][3][4][5] have established that the hole mobility is well described by…”

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confidence: 99%

Simultaneous measurement of electron and hole mobilities in polymer light-emitting diodes

Martens¹,

Huiberts²,

Blom³

2000

Applied Physics Letters

191

121

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The transport properties of electrons and holes in a poly(p-phenylene vinylene)-based polymer light-emitting diode (PLED) have been investigated. Using admittance spectroscopy, we are able to simultaneously obtain the electron and hole mobility, μ=μ0 exp(γE), in a single PLED. The dynamics of the electron and hole transport are separated in the frequency domain as a result of the different transit times. At room temperature, we find μ0=5.6×10−11 m2/V s and γ=5.0×10−4 (m/V)1/2 for holes. For electrons μ0=1.0×10−12 m2/V s and γ=8.0×10−4 (m/V)1/2 are obtained.

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Charge carrier mobility in poly(p-phenylenevinylene) studied by the time-of-flight technique

Cited by 162 publications

References 14 publications

Monte Carlo simulations of charge transport in organic systems with true off-diagonal disorder

Monte Carlo simulations of charge transport in organic systems with true off-diagonal disorder

Charge transport in highly efficient iridium cored electrophosphorescent dendrimers

Simultaneous measurement of electron and hole mobilities in polymer light-emitting diodes

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