dc and transient photoconductivity of poly(2-phenyl-1,4-phenylenevinylene)

Gailberger, Michael; Bäßler, H.

doi:10.1103/physrevb.44.8643

Cited by 211 publications

(79 citation statements)

References 50 publications

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“…Mobility measurements in PPV derivatives are more abundant. Many of these 24,34,35 point to the difficulties of making a distinction between the two dependencies. It is, hence, still unclear how to describe the temperature dependence in PPV.…”

Section: Discussionmentioning

confidence: 99%

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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%

“…The standard deviation of the Gaussian distribution is set to 80 meV. A value of 90 meV has been reported for PPV, 24 but a slightly lower value was chosen out of performance reasons for the Monte Carlo simulations.…”

Section: B Diagonal Disordermentioning

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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“…(10) applied with different chromophores sizes, n i ∈ [5,10], is roughly equivalent to a pure Gaussian distribution of width 90 meV, as reported for PPV. 12 The blue bars correspond to the lowest-lying orbitals of the chromophores, i.e., an orbital with an energy in this range is always available, no matter which chromophore is considered. It is worth noting that the Hückel model (Eq.…”

Section: Methodsmentioning

confidence: 99%

“…The attempts 13,16,17,[19][20][21] that have been made to explain a maximum or decreasing mobility for an increasing field 12,13,20,22,23 in disordered organic materials as an effect of Marcus theory and its inverted region have in many cases been abandoned in favor of the disorder model. 11,12,20,23,24 The common reason for this is that the parameters needed to fit the analytical expressions given by Eqs. (7) and (8) fall outside the interval of physically reasonable values and therefore, in many cases, the conclusions have been that polaron effects do not play an important role for charge transport in conjugated polymers.…”

Section: Introductionmentioning

confidence: 99%

“…9 There are some indirect experimental results in support of a Gaussian DOS, but the main reason for the trust the GDM has received is its ability to explain a wide range of experimental observations related to charge transport in molecularly doped polymers and conjugated polymers. [9][10][11][12][13][14][15] A characteristic feature of the GDM is a temperature and applied electric field dependence of the mobility, given by…”

Section: Introductionmentioning

confidence: 99%

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Polaron effects and electric field dependence of the charge carrier mobility in conjugated polymers

Jakobsson

Stafström

2011

The Journal of Chemical Physics

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Charge transport in conjugated polymers has been investigated using Monte Carlo simulations implemented on top of the Marcus theory for donor-acceptor transition rates. In particular, polaron effects and the dependency of the mobility on the temperature and the applied electric field have been studied. The conclusions are that while the qualitative temperature dependence is similar to that predicted by Miller-Abrahams theory in the Gaussian disorder model (GDM), the electric field dependence is characterized by a crossover into the Marcus inverted region, not present in the GDM. Furthermore, available analytical approximations to describe the electric field dependence of the mobility in Marcus theory fail to fit the simulation data and hence cannot be used to directly draw conclusions about the importance of polaron effects for charge transport in conjugated polymers.

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Semiconductors, Organic—Electronic Properties

Pope

Swenberg

2003

Digital Encyclopedia of Applied Physics

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dc and transient photoconductivity of poly(2-phenyl-1,4-phenylenevinylene)

Cited by 211 publications

References 50 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

Polaron effects and electric field dependence of the charge carrier mobility in conjugated polymers

Semiconductors, Organic—Electronic Properties

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