The role of short-ranged energetic correlations in the mobility field dependence of disordered organic materials

Tonezer, Camila; Freire, José A.

doi:10.1063/1.2822162

Cited by 9 publications

(3 citation statements)

References 24 publications

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“…The difference between the eqs 2 and 4 is the predicted temperature dependence of γ. Recently, it has been shown that the form (short ranged or long ranged) of energy correlation can be distinguished from the temperature dependence of γ 25. However, the experimental data obtained in our study is unable to distinguish between the short range correlated energies and power‐law correlated energies as the parameter γ varies almost linearly with (σ/ kT ) as well as with $ (\sigma/kT) - 2 \sqrt{kT/\sigma} $ .…”

Section: Resultscontrasting

confidence: 72%

Expression patterns and cell cycle profiles of PCNA, MCM6, cyclin D1, cyclin A2, cyclin B1, and phosphorylated histone H3 in the developing mouse retina

Barton

Levine

2008

Developmental Dynamics

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A challenge in studying organogenesis is the ability to identify progenitor cell populations. To address this problem, we characterized the expression patterns of cell cycle proteins during mouse retinal development and used flow cytometry to determine the expression profiles in the cell cycle. We found that MCM6 and PCNA are expressed in essentially all retinal progenitor cells throughout the proliferative period and these proteins are readily detectable in all cell cycle phases. Furthermore, their expression levels are downregulated as cells exit the cell cycle and differentiate. We also analyzed the expression of Cyclins D1, A2, and B1, and phosphorylated Histone H3 and found unexpected expression patterns and cell cycle profiles. The combined utilization of the markers tested and the use of flow cytometry should further facilitate the study of stem and progenitor cell behavior during development and in adult tissues. Developmental Dynamics 237:672-682, 2008.

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Section: Resultscontrasting

confidence: 72%

Expression patterns and cell cycle profiles of PCNA, MCM6, cyclin D1, cyclin A2, cyclin B1, and phosphorylated histone H3 in the developing mouse retina

Barton

Levine

2008

Developmental Dynamics

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“…Lattice model calculations using the correlated Gaussian disorder model showed that a higher correlation length (coupling among sites which are far apart) leads to a steeper Poole-Frenkel slope. 66,67 Fig. 4 shows the reduced site energy correlation function…”

Section: Site Energy Correlationmentioning

confidence: 99%

Molecular origin of differences in hole and electron mobility in amorphous Alq3—a multiscale simulation study

Fuchs

Steinbrecher

Mommer

et al. 2012

Phys. Chem. Chem. Phys.

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In order to determine the molecular origin of the difference in electron and hole mobilities of amorphous thin films of Alq(3) (meridional Alq(3) (tris(8-hydroxyquinoline) aluminium)) we performed multiscale simulations covering quantum mechanics, molecular mechanics and lattice models. The study includes realistic disordered morphologies, polarized site energies to describe diagonal disorder, quantum chemically calculated transfer integrals for the off-diagonal disorder, inner sphere reorganization energies and an approximative scheme for outer sphere reorganization energies. Intermolecular transfer rates were calculated via Marcus-theory and mobilities were simulated via kinetic Monte Carlo simulations and by a Master Equation approach. The difference in electron and hole mobility originates from the different localization of charge density in the radical anion (more delocalized) compared to the radical cation (more confined). This results in higher diagonal disorder for holes and less favourable overlap properties for the hole transfer integrals leading to an overall higher electron mobility.

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“…8,9 Now that we have established the mechanism behind the correlation, what remains to be done is to calculate the mobility field dependence in a model of disordered sites with site energies given by the chargeinduced dipole interaction. …”

Section: Discussionmentioning

confidence: 99%

Density of states and energetic correlation in disordered molecular systems due to induced dipoles

Freire

Tonezer

2009

The Journal of Chemical Physics

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We have considered two models for a system of disordered organic molecules: one based on a regular lattice with Gaussian site displacements and another based on a hard sphere distribution. The site energies were given by a charge-induced dipole interaction (the polarization energy). We obtained the density of states of both models and observed that it changes from a Gaussian to the density of states of a uniform site distribution, whose form was obtained analytically, depending on the degree of disorder in one model or the packing fraction in the other model. The site energy distribution is short-ranged correlated in both models since nearby molecules polarize basically the same disordered environment.

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The role of short-ranged energetic correlations in the mobility field dependence of disordered organic materials

Cited by 9 publications

References 24 publications

Expression patterns and cell cycle profiles of PCNA, MCM6, cyclin D1, cyclin A2, cyclin B1, and phosphorylated histone H3 in the developing mouse retina

Expression patterns and cell cycle profiles of PCNA, MCM6, cyclin D1, cyclin A2, cyclin B1, and phosphorylated histone H3 in the developing mouse retina

Molecular origin of differences in hole and electron mobility in amorphous Alq3—a multiscale simulation study

Density of states and energetic correlation in disordered molecular systems due to induced dipoles

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