Two-Dimensional Electronic Transport in Rubrene: The Impact of Inter-Chain Coupling

Organic semi-conductors have unique electronic properties and are important systems both at the fundamental level and also for their applications in electronic devices. In this article we focus on the particular case of rubrene which has one of the best electronic transport properties for applicatio...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2019-02, Vol.21 (3), p.233
Main Authors: Missaoui, Ahmed, Khabthani, Jouda, Trambly de Laissardière, Guy, Mayou, Didier
Format: Article
Language:English
Subjects:
Anisotropy
Chains
Chemical elements
Condensed Matter
Conductivity
Conductors
Coupling
electrical conductivity
Electron transport
Electronic devices
Electronic properties
High temperature
Localization
Materials Science
numerical study
Optical properties
Organic light emitting diodes
organic semi-conductors
Physics
quantum transport
rubrene
Semiconductors
Transport properties
Two dimensional analysis
Two dimensional models
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Summary:Organic semi-conductors have unique electronic properties and are important systems both at the fundamental level and also for their applications in electronic devices. In this article we focus on the particular case of rubrene which has one of the best electronic transport properties for application purposes. We show that this system can be well simulated by simple tight-binding systems representing one-dimensional (1D) chains that are weakly coupled to their neighboring chains in the same plane. This makes in principle this rubrene system somehow intermediate between 1D and isotropic 2D models. We analyse in detail the dc-transport and terahertz conductivity in the 1D and in the anisotropic 2D models. The transient localisation scenario allows us to reproduce satisfactorily some basics results such as mobility anisotropy and orders of magnitude as well as ac-conductivity in the terahertz range. This model shows in particular that even a weak inter-chain coupling is able to improve notably the propagation along the chains. This suggest also that a strong inter-chain coupling is important to get organic semi-conductors with the best possible transport properties for applicative purposes.
ISSN:1099-4300
1099-4300
DOI:10.3390/e21030233