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Front. Mater. | doi: 10.3389/fmats.2019.00204

Theory of Thermionic Carrier Injection in Graphene/Organic Schottky Interface

 Yee Sin Ang1* and L. K. Ang1*
  • 1Singapore University of Technology and Design, Singapore

Understanding the physics of charge transport in organic materials and charge injection across organic-based interface is critically important for the development of novel organic electronics and optoelectronics. Despite extensive efforts devoted to the study of transport and injection phenomena in organic materials and interfaces, the physics of thermionic carrier injection across graphene/organic interface remains largely incomplete thus far. Here we construct a model of thermionic carrier injection across a graphene/organic Schottky interface based on the Lengevin theory of charge recombination and the detailed balance formalism. We show that, due to the strong electrostatic doping effect in graphene under the influence of an external gate voltage, the electrical current traversing the interface differs significantly from conventional bulk-metal/organic Schottky interface and the injection current can be efficiently modulated by a gate-voltage to achieve an on-off ratio well-exceed $10^7$. The model developed here shall provide a theoretical foundation for the understanding graphene/organic Schottky interface, thus paving the way towards the development of novel nanoscale graphene-hybrid organic electronic and optoelectronic devices.

Keywords: Graphene, Schottky diode, organic elecronics, electrical contact, Charge injection and transport, thermionic and tunneling current

Received: 30 Apr 2019; Accepted: 07 Aug 2019.

Copyright: © 2019 Ang and Ang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence:
Dr. Yee Sin Ang, Singapore University of Technology and Design, Singapore, Singapore, yeesin_ang@sutd.edu.sg
Mx. L. K. Ang, Singapore University of Technology and Design, Singapore, Singapore, ricky_ang@sutd.edu.sg