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The role of diffusion on SCLC transport in double injection devices

Neumann, Frederik ; Genenko, Yuri A. ; Schmechel, Roland ; Seggern, Heinz von :
The role of diffusion on SCLC transport in double injection devices.
[Online-Edition: http://www.sciencedirect.com/science/article/pii/S0379677905...]
In: Synthetic metals, 150 (3) pp. 291-296.
[Artikel], (2005)
Note:

SFB 595 Cooperation C5, D4

Offizielle URL: http://www.sciencedirect.com/science/article/pii/S0379677905...

Kurzbeschreibung (Abstract)

A theoretical study of SCLC transport in double injection insulators is presented. It will be demonstrated, that the inclusion of charge carrier diffusion, neglected in many previous studies of transport in organic light emitting diodes (OLEDs), is essential to obtain physical meaningful spatial charge carrier densities and field distributions. Only the knowledge of such correct spatial distributions enables one to compute the correct position of the charge carrier recombination zone. In previous calculations without diffusion the recombination process often takes place in the vicinity of both electrodes, even for equal mobilities of holes and electrons. In the present calculation including diffusion it is demonstrated that only one recombination zone exists. For equal mobilities of electrons and holes the recombination zone is found as expected in the centre of the device whereas for different mobility values it may be strongly shifted to one of the electrodes. The resulting I–V characteristics indicate that, in double injection devices, the well-known Mott–Gurney law holds only at sufficiently high voltages and only if recombination is taken into account. For small voltages, an ohmic-like behavior is observed in any case, however, if no recombination is assumed a transition to an I ∼ V3 law is obtained for higher voltages. Due to the inclusion of diffusion, all I–V characteristics exhibit temperature dependence.

Typ des Eintrags: Artikel
Erschienen: 2005
Autor(en): Neumann, Frederik ; Genenko, Yuri A. ; Schmechel, Roland ; Seggern, Heinz von
Titel: The role of diffusion on SCLC transport in double injection devices
Sprache: Englisch
Kurzbeschreibung (Abstract):

A theoretical study of SCLC transport in double injection insulators is presented. It will be demonstrated, that the inclusion of charge carrier diffusion, neglected in many previous studies of transport in organic light emitting diodes (OLEDs), is essential to obtain physical meaningful spatial charge carrier densities and field distributions. Only the knowledge of such correct spatial distributions enables one to compute the correct position of the charge carrier recombination zone. In previous calculations without diffusion the recombination process often takes place in the vicinity of both electrodes, even for equal mobilities of holes and electrons. In the present calculation including diffusion it is demonstrated that only one recombination zone exists. For equal mobilities of electrons and holes the recombination zone is found as expected in the centre of the device whereas for different mobility values it may be strongly shifted to one of the electrodes. The resulting I–V characteristics indicate that, in double injection devices, the well-known Mott–Gurney law holds only at sufficiently high voltages and only if recombination is taken into account. For small voltages, an ohmic-like behavior is observed in any case, however, if no recombination is assumed a transition to an I ∼ V3 law is obtained for higher voltages. Due to the inclusion of diffusion, all I–V characteristics exhibit temperature dependence.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Synthetic metals
Band: 150
(Heft-)Nummer: 3
Verlag: Elsevier Science Publishing
Freie Schlagworte: Organic light emitting diodes, Simulation, Diffusion, Space charge limited current
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Elektronische Materialeigenschaften
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Materialmodellierung
Zentrale Einrichtungen
Zentrale Einrichtungen > Sonderforschungsbereich 595
Zentrale Einrichtungen > Sonderforschungsbereich 595 > C - Modellierung
Zentrale Einrichtungen > Sonderforschungsbereich 595 > C - Modellierung > C5
Zentrale Einrichtungen > Sonderforschungsbereich 595 > D - Bauteileigenschaften
Zentrale Einrichtungen > Sonderforschungsbereich 595 > D - Bauteileigenschaften > D4
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 20 Nov 2008 08:22
Offizielle URL: http://www.sciencedirect.com/science/article/pii/S0379677905...
Zusätzliche Informationen:

SFB 595 Cooperation C5, D4

Sponsoren: This work was supported by the Deutsche Forschungsgemeinschaft through the Sonderforschungsbereich 595.
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