Electron transport in the organic small-molecule material BAlq - the role of correlated disorder and traps

S.L.M. Mensfoort, van; R.J. Vries, de; V. Shabro; H.P. Loebl; R.A.J. Janssen; R. Coehoorn

doi:10.1016/j.orgel.2010.05.014

Electron transport in the organic small-molecule material BAlq - the role of correlated disorder and traps

S.L.M. Mensfoort, van, R.J. Vries, de, V. Shabro, H.P. Loebl, R.A.J. Janssen, R. Coehoorn

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Abstract

An analysis is presented of the layer-thickness dependent and temperature-dependent current density in sandwich-type electron-only devices based on the amorphous small-molecule organic semiconductor BAlq, which is frequently used in organic light-emitting diodes. The electron transport can be consistently described by assuming a density of states (DOS) which is a superposition of a Gaussian DOS and an exponential trap DOS, with 85 and 100 meV widths, respectively, using a mobility model which includes the carrier density dependence of the mobility in the Gaussian DOS and assuming either random or spatially correlated site energies. From a comparison of the density of hopping sites obtained from both models and the density of molecules as obtained from chemical analysis, evidence for the presence of correlated disorder is found.

Original language	English
Pages (from-to)	1408-1413
Number of pages	5
Journal	Organic Electronics
Volume	11
Issue number	8
DOIs	https://doi.org/10.1016/j.orgel.2010.05.014
Publication status	Published - 2010

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10.1016/j.orgel.2010.05.014

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@article{b38b75a9eb024cf08ec7545a1b557179,

title = "Electron transport in the organic small-molecule material BAlq - the role of correlated disorder and traps",

abstract = "An analysis is presented of the layer-thickness dependent and temperature-dependent current density in sandwich-type electron-only devices based on the amorphous small-molecule organic semiconductor BAlq, which is frequently used in organic light-emitting diodes. The electron transport can be consistently described by assuming a density of states (DOS) which is a superposition of a Gaussian DOS and an exponential trap DOS, with 85 and 100 meV widths, respectively, using a mobility model which includes the carrier density dependence of the mobility in the Gaussian DOS and assuming either random or spatially correlated site energies. From a comparison of the density of hopping sites obtained from both models and the density of molecules as obtained from chemical analysis, evidence for the presence of correlated disorder is found.",

author = "{Mensfoort, van}, S.L.M. and {Vries, de}, R.J. and V. Shabro and H.P. Loebl and R.A.J. Janssen and R. Coehoorn",

year = "2010",

doi = "10.1016/j.orgel.2010.05.014",

language = "English",

volume = "11",

pages = "1408--1413",

journal = "Organic Electronics",

issn = "1566-1199",

publisher = "Elsevier",

number = "8",

}

TY - JOUR

T1 - Electron transport in the organic small-molecule material BAlq - the role of correlated disorder and traps

AU - Mensfoort, van, S.L.M.

AU - Vries, de, R.J.

AU - Shabro, V.

AU - Loebl, H.P.

AU - Janssen, R.A.J.

AU - Coehoorn, R.

PY - 2010

Y1 - 2010

N2 - An analysis is presented of the layer-thickness dependent and temperature-dependent current density in sandwich-type electron-only devices based on the amorphous small-molecule organic semiconductor BAlq, which is frequently used in organic light-emitting diodes. The electron transport can be consistently described by assuming a density of states (DOS) which is a superposition of a Gaussian DOS and an exponential trap DOS, with 85 and 100 meV widths, respectively, using a mobility model which includes the carrier density dependence of the mobility in the Gaussian DOS and assuming either random or spatially correlated site energies. From a comparison of the density of hopping sites obtained from both models and the density of molecules as obtained from chemical analysis, evidence for the presence of correlated disorder is found.

AB - An analysis is presented of the layer-thickness dependent and temperature-dependent current density in sandwich-type electron-only devices based on the amorphous small-molecule organic semiconductor BAlq, which is frequently used in organic light-emitting diodes. The electron transport can be consistently described by assuming a density of states (DOS) which is a superposition of a Gaussian DOS and an exponential trap DOS, with 85 and 100 meV widths, respectively, using a mobility model which includes the carrier density dependence of the mobility in the Gaussian DOS and assuming either random or spatially correlated site energies. From a comparison of the density of hopping sites obtained from both models and the density of molecules as obtained from chemical analysis, evidence for the presence of correlated disorder is found.

U2 - 10.1016/j.orgel.2010.05.014

DO - 10.1016/j.orgel.2010.05.014

M3 - Article

SN - 1566-1199

VL - 11

SP - 1408

EP - 1413

JO - Organic Electronics

JF - Organic Electronics

IS - 8

ER -

Electron transport in the organic small-molecule material BAlq - the role of correlated disorder and traps

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