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Nonequilibrium drift-diffusion model for organic semiconductor devices
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7104-7127
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950 (print); 2469-9969 (online), Vol. 94, no 3, 035205Article in journal (Refereed) Published
Abstract [en]

Two prevailing formalisms are currently used to model charge transport in organic semiconductor devices. Drift-diffusion calculations, on the one hand, are time effective but assume local thermodynamic equilibrium, which is not always realistic. Kinetic Monte Carlo models, on the other hand, do not require this assumption but are computationally expensive. Here, we present a nonequilibrium drift-diffusion model that bridges this gap by fusing the established multiple trap and release formalism with the drift-diffusion transport equation. For a prototypical photovoltaic system the model is shown to quantitatively describe, with a single set of parameters, experiments probing (1) temperature-dependent steady-state charge transport-space-charge limited currents, and (2) time-resolved charge transport and relaxation of nonequilibrated photocreated charges. Moreover, the outputs of the developed kinetic drift-diffusion model are an order of magnitude, or more, faster to compute and in good agreement with kinetic Monte Carlo calculations.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2016. Vol. 94, no 3, 035205
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URN: urn:nbn:se:liu:diva-131516DOI: 10.1103/PhysRevB.94.035205ISI: 000381482700003OAI: oai:DiVA.org:liu-131516DiVA: diva2:974402
Available from: 2016-09-26 Created: 2016-09-23 Last updated: 2016-10-19

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Felekidis, NikolaosMelianas, ArmantasKemerink, Martijn
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Complex Materials and DevicesFaculty of Science & EngineeringBiomolecular and Organic Electronics
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