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Two-Dimensional Electronic Transport in Rubrene: The Impact of Inter-Chain Coupling
Ahmed Missaoui1,2, Jouda Jemaa Khabthani3, Guy Trambly de Laissardière2
1Laboratoire de Spectroscopie Atomique Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus Universitaire, 1060 Tunis, Tunisia.
Entropy (Basel, Switzerland)
|December 3, 2020
Summary
Organic semiconductors like rubrene exhibit excellent electronic properties. Simple models show weak inter-chain coupling significantly enhances charge transport, crucial for device applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Organic Electronics
Background:
- Organic semiconductors possess unique electronic properties valuable for fundamental research and electronic device applications.
- Rubrene stands out for its exceptional electronic transport characteristics, making it a prime candidate for practical applications.
Purpose of the Study:
- To investigate the electronic transport properties of rubrene using simplified theoretical models.
- To analyze the impact of inter-chain coupling on charge transport in organic semiconductor systems.
Main Methods:
- Simulation of rubrene using one-dimensional (1D) tight-binding chains with weak inter-chain coupling.
- Analysis of direct current (dc) transport and terahertz (THz) conductivity in 1D and anisotropic 2D models.
- Application of the transient localization scenario to explain observed transport phenomena.
Main Results:
- The rubrene system can be effectively modeled as weakly coupled 1D chains, behaving intermediately between 1D and 2D systems.
- The transient localization model successfully reproduces key experimental results, including mobility anisotropy and THz conductivity.
- Even minimal inter-chain coupling substantially improves charge propagation along the chains.
Conclusions:
- Weak inter-chain coupling is vital for enhancing charge transport in organic semiconductors.
- Strong inter-chain coupling is essential for optimizing the performance of organic semiconductors in electronic devices.
- The developed theoretical model provides valuable insights into the fundamental charge transport mechanisms in organic materials.
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