Measurement of diffusion and drift of charge carriers from photocurrent transients

Hirao, Akiko; Nishizawa, Hideyuki

doi:10.1103/physrevb.54.4755

Cited by 35 publications

(29 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yet experimental data do not agree with this relation [2,3]. The field dependence of t D is very important for the problem of ultimate resolution and quality of color reproduction in organic devices.…”

Section: Introductionmentioning

confidence: 84%

“…At the same time most studies are focused on the behavior of carrier mobility µ : its temperature and field dependence, effect of dopants etc. The same dependences for the longitudinal l D and transversal t D diffusion coefficients are much less studied, papers on longitudinal diffusion in organic materials are scarce [1][2][3], while the transversal diffusion, to the best of our knowledge, has not been discussed at all.…”

Section: Introductionmentioning

confidence: 91%

“…(2), the 1D model predicts that the field dependence of the diffusion coefficient is described by the Poole-Frenkel (PF) rela- [2,3]. In this situation the increase of the electric field leads to the significant degradation of Γ.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Transversal and longitudinal diffusion in polar disordered organic materials

Novikov

Malliaras

2006

Physica Status Solidi (b)

View full text Add to dashboard Cite

Longitudinal and transversal diffusion of charge carriers in disordered polar organic materials has been studied using Monte Carlo simulation. It was found that the simple Einstein relation is valid for the transversal diffusion coefficient, while neither the simple nor the modified Einstein relation is valid for the longitudinal diffusion coefficient. Effect of the field dependence of the transversal diffusion coefficient on the ultimate resolution of organic devices has been discussed.

show abstract

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 91%

See 1 more Smart Citation

Transversal and longitudinal diffusion in polar disordered organic materials

Novikov

Malliaras

2006

Physica Status Solidi (b)

View full text Add to dashboard Cite

show abstract

“…Yet the shape of the transients differs significantly from the result of the simple diffusive approximation, which was suggested for the description of experimental TOF transients. [59][60][61] Two major differences are the universality of the transients with respect to L and power law decay of the tail. It is worth noting that universality with respect to L naturally arises in the model where charge transport is described by the broad distribution of the effective carrier velocities, 51,62 but universality with respect to E cannot be explained by this approach.…”

Section: Discussionmentioning

confidence: 99%

Charge carrier transport in molecularly doped polycarbonate as a test case for the dipolar glass model

Новиков

Tyutnev

2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

We present the results of Monte-Carlo simulations of the charge carrier transport in a disordered molecular system containing spatial and energetic disorders using the dipolar glass model. Model parameters of the material were chosen to fit a typical polar organic photoconductor polycarbonate doped with 30% of aromatic hydrazone, whose transport properties are well documented in literature. Simulated carrier mobility demonstrates a usual Poole-Frenkel field dependence and its slope is very close to the experimental value without using any adjustable parameter. At room temperature transients are universal with respect to the electric field and transport layer thickness. At the same time, carrier mobility does not depend on the layer thickness and transients develop a well-defined plateau where the current does not depend on time, thus demonstrating a non-dispersive transport regime. Tails of the transients decay as power law with the exponent close to -2. This particular feature indicates that transients are close to the boundary between dispersive and non-dispersive transport regimes. Shapes of the simulated transients are in very good agreement with the experimental ones. In summary, we provide a first verification of a self-consistency of the dipolar glass transport model, where major transport parameters, extracted from the experimental transport data, are then used in the transport simulation, and the resulting mobility field dependence and transients are in very good agreement with the initial experimental data.

show abstract

“…This is one of the most successful studies for charge transports. However, this approach, including related ones [10][11][12][13][14][15][16][17], does not consider the organic molecule explicitly.…”

Section: Introductionmentioning

confidence: 98%

Organic light-emitting diodes: multiscale charge transport simulation and fabrication of new thermally activated delayed fluorescence (TADF) materials

Kaji¹,

Shizu²,

Suzuki³

et al. 2015

SPIE Proceedings

View full text Add to dashboard Cite

Charge transports in amorphous thin films with 100 nm thickness are investigated in silico by explicitly considering organic molecules. The amorphous layer of organic molecules was constructed using molecular dynamics simulations. The rate constants for charge hopping between two organic molecules, extracted from the amorphous layers, were calculated based on quantum chemical calculations. The hopping transport in amorphous layers was simulated using a Monte Carlo method. The hole mobility was calculated to be several times larger than the electron mobility, which was consistent with the experimental results. The Monte Carlo simulation also shows that diffusion transport is dominant at low applied electric fields and that contribution of drift transport increases at high electric fields. The simulation in this study enables us to reveal molecular origin of charge transport. In the presentation, we will show the results on recentlydeveloped new thermally activated delayed fluorescence materials and the device performances.

show abstract

Measurement of diffusion and drift of charge carriers from photocurrent transients

Cited by 35 publications

References 27 publications

Transversal and longitudinal diffusion in polar disordered organic materials

Transversal and longitudinal diffusion in polar disordered organic materials

Charge carrier transport in molecularly doped polycarbonate as a test case for the dipolar glass model

Organic light-emitting diodes: multiscale charge transport simulation and fabrication of new thermally activated delayed fluorescence (TADF) materials

Contact Info

Product

Resources

About