Drift-velocity saturation of holes in anthracene at room temperature

Bitterling, K.; Willig, F.

doi:10.1103/physrevb.35.7973

Cited by 18 publications

(4 citation statements)

References 17 publications

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“…The high-temperature limit of the mobility was determined by plotting the intercepts of the extrapolated In p -E plots at E = 0 against 1/T yielding values of 1780 and 86 cm2 Vspl for mobility data obtained by curve fitting and the method of the asymptotes, respectively. These data, obtained for a dilute dispersion of p-p-EFTP in polycarbonate, exceed the data obtained for anthracene single crystals [39,40] by several orders of magnitude. This is a further argument against the analysis of the mobility data in the framework of a polaron model.…”

Section: P E = R K ( Lexp ( -E E R / K T ) Exp[ -( -E E R + I)2/4akt]contrasting

confidence: 60%

Anomalous Field Dependence of the Hole Mobility in a Molecular Doped Polymer

Novo

Auweraer

Schryver

et al. 1993

Physica Status Solidi (b)

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Photocurrent transients are determined in polycarbonate doped with 17 wt% of p-p-EFTP (see structurc below) as a function of the electric field strength and the temperature. The hole mobilities are obtained both by a graphical method and by computational analysis based on an analytical expression for the transient photocurrent which has been recently proposed by Scott et al. The comparison of the results obtained with the two methods shows that, although the absolute values of the mobilities differ by a factor of 1.5. the field and temperature dcpendencies of the hole mobility are similar. The system studied shows an anomalous field dependence of the mobility which at low fields increases with increasing field to a maximum above which it decreases with increasing field. Such a behaviour is analysed in the framework of two different theoretical models: one based on the Marcus theory of electron-transfer processes and Bassler's model which takes into account the fluctuations in hopping sites due to the simultaneous presence of diagonal and off-diagonal disorder. While the first model does not provide ;I satisfactory description of the experimental data, the latter cannot explain qualitatively the observed field dependence over a wide range of applied fields. The predicted saturation of the drift velocity of thc holes at high fields docs not agree with the observed temperature dependence of the mobility at high fields. This disagreement with the conventional models is probably due to the large dimensions of the molecules allowing a change in the free energy for nearest-neighbour hops which is large compared to the polaron binding energy or the width of the distribution of the density of states.

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Section: P E = R K ( Lexp ( -E E R / K T ) Exp[ -( -E E R + I)2/4akt]contrasting

confidence: 60%

Anomalous Field Dependence of the Hole Mobility in a Molecular Doped Polymer

Novo

Auweraer

Schryver

et al. 1993

Physica Status Solidi (b)

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“…We mention that an equation similar to (9) has already been applied to explain thermoelectric phenomena in low-mobility semiconductors [7] and the almost temperature-independent electron mobility in the c' direction of selected aromatic crystals [3,8,91. A controversy about its application to anthracene crystal is known in the literature [3,4,10 to 121. The question raised is the field strength at which drift velocity saturation can appear in the context of electron coupling to particular lattice vibrations (hw,,).…”

Section: Generalized Current Equationmentioning

confidence: 99%

“…is no longer proportional to the applied field (2). Recent experimental results on the drift velocity saturation of electrons [3] and holes [4] in anthracene crystals have brought such a situation to a more realistic level and to the necessity of a theoretical description of the ELC with the field-saturating drift velocity of charge carriers. This paper is an attempt to give such a description for low-mobility solids, where a kinetic model for the charge carrier motion can be safely applied.…”

Section: Introductionmentioning

confidence: 99%

“…A large group of molecular solids fulfils these conditions, a model material is anthracene [S]. In the c' direction in anthracene crystals the mobility of holes (0.9 & 0.1) cm2/Vs has been measured in the linear response range and the mean free path for the carriers is assumed not to be significantly larger than the lattice spacing, i.e., 0.92 nm [4]. Therefore, in the present paper, we will confine our considerations to the limited range of the mean free paths with respect to a scattering event, 0 < 1 5 2nm, referring often the results to the example of anthracene crystals.…”

Section: Introductionmentioning

confidence: 99%

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Emission‐limited currents in low‐mobility solids

Godlewski¹,

Kalinowski²,

Mancini

et al. 1994

Physica Status Solidi (b)

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Results of computer-calculated solutions of a set of equations describing emission-limited currents (ELC) in low-mobility solids are presented. The continuity of current equation with electric field-dependent mobility is used to calculate the field dependence of ELC under various injection conditions. Its shape and steepness are found to change strongly with decreasing scattering length of injected carriers, approaching the standard description of the one-dimensional Onsager model with field-independent mobility. The recombination of the charge carriers at the contact is shown to reduce the current without remarkable change of its functional dependence on practically accessible electric fields.

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Electron Transfer

Twigg¹

1989

Mechanisms of Inorganic and Organometallic Reactions

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Drift-velocity saturation of holes in anthracene at room temperature

Cited by 18 publications

References 17 publications

Anomalous Field Dependence of the Hole Mobility in a Molecular Doped Polymer

Anomalous Field Dependence of the Hole Mobility in a Molecular Doped Polymer

Emission‐limited currents in low‐mobility solids

Electron Transfer

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