Space-charge-limited currents in inhomogeneous thin-film insulators: numerical solutions

Bąk, Grzegorz

doi:10.1088/0953-8984/8/23/007

J. Phys.: Condens. Matter

1996

DOI: 10.1088/0953-8984/8/23/007

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Space-charge-limited currents in inhomogeneous thin-film insulators: numerical solutions

Grzegorz Bąk¹

Abstract: Numerical solutions for SCL currents in inhomogeneous insulators with non-uniform trap distributions are presented. It turns out that the non-uniform trap distribution which may be expected in the case of real insulators should have a significant influence on SCL current-voltage characteristics. The experimental results for some organic molecular polycrystalline structures may be interpreted by using the numerical solutions obtained. A method of determination of the spatial trap distribution at the emitter by … Show more

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Cited by 2 publications

References 16 publications

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Unipolar space-charge limited current through layers with a disparate concentration of shallow traps: Experiment and model

Fleissner

Weise

Seggern

2005

Journal of Applied Physics

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Interpretation of trap-limited mobility in space-charge limited current in organic layers with exponential density of traps J. Appl. Phys. 110, 043705 (2011); 10.1063/1.3622615 Space-charge limited conduction in doped polypyrrole devices J. Appl. Phys. 107, 093716 (2010); 10.1063/1.3373393Field-dependent mobility from space-charge-limited current-voltage curvesThe influence of the spatial distribution of trap states on unipolar space-charge limited current ͑SCLC͒ is investigated experimentally and theoretically. Thin-layered films of the small molecule organic semiconductor N , NЈ-di͑1-naphtyl͒-N,NЈ-diphenylbenzidine ͑␣-NPD͒ are vapor deposited on indium tin oxide, with aluminum as the counter electrode. The small molecule 4,4Ј ,4Љ-tris-͓N-͑1-naphtyl͒-N-͑phenylamino͔͒-triphenylamine ͑1-NaphDATA͒, which creates well-known shallow traps for holes, is used as dopant. The realized organic films consist of three layers, one of which is homogeneously doped. The influence of the spatial position of the doped layer on the current-voltage characteristics of the diodes is examined. Compared to an undoped device, the current density is strongly decreased and varies over orders of magnitude for the different spatial positions of the doped layer. It is shown that traps near the injecting electrode have the most pronounced effect on SCLC. A model for unipolar SCLC through a system of homogeneous layers with different trapping parameters for shallow traps is presented. The model quantitatively describes the experimental data and is used to calculate the spatial distributions of the charge-carrier density and the electric-field strength in the differently doped devices.

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Unipolar space-charge limited current through layers with a disparate concentration of shallow traps: Experiment and model

Fleissner

Weise

Seggern

2005

Journal of Applied Physics

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Physical mechanisms in double-carrier trap-charge limited transport processes in organic electroluminescent devices: A numerical study

Shen

Yang

1998

Journal of Applied Physics

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We have developed a numerical model to simulate the double-carrier injection trap-charge limited (TCL) transport processes in organic electroluminescent devices (OEDs). Current–voltage characteristics, energy and charge profiles are obtained and analyzed to understand the mechanisms governing the OED performance under TCL conditions. Good agreement with general experimental trends and previous analytical predictions are achieved. Dependencies on several important parameters (carrier injection level, device thickness, recombination constant, temperature, etc.) are also studied.

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Space-charge-limited currents in inhomogeneous thin-film insulators: numerical solutions

Cited by 2 publications

References 16 publications

Unipolar space-charge limited current through layers with a disparate concentration of shallow traps: Experiment and model

Unipolar space-charge limited current through layers with a disparate concentration of shallow traps: Experiment and model

Physical mechanisms in double-carrier trap-charge limited transport processes in organic electroluminescent devices: A numerical study

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