Multi-scale calculation of the electric properties of organic-based devices from the molecular structure

Type
Article

Authors
Li, Haoyuan
Qiu, Yong
Duan, Lian

KAUST Department
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division

Online Publication Date
2016-03-24

Print Publication Date
2016-06

Date
2016-03-24

Abstract
A method is proposed to calculate the electric properties of organic-based devices from the molecular structure. The charge transfer rate is obtained using non-adiabatic molecular dynamics. The organic film in the device is modeled using the snapshots from the dynamic trajectory of the simulated molecular system. Kinetic Monte Carlo simulations are carried out to calculate the current characteristics. A widely used hole-transporting material, N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (NPB) is studied as an application of this method, and the properties of its hole-only device are investigated. The calculated current densities and dependence on the applied voltage without an injection barrier are close to those obtained by the Mott-Gurney equation. The results with injection barriers are also in good agreement with experiment. This method can be used to aid the design of molecules and guide the optimization of devices. © 2016 Elsevier B.V. All rights reserved.

Citation
Li H, Qiu Y, Duan L (2016) Multi-scale calculation of the electric properties of organic-based devices from the molecular structure. Organic Electronics 33: 164–171. Available: http://dx.doi.org/10.1016/j.orgel.2016.03.016.

Acknowledgements
We would like to thank the National Natural Science Foundation of China (Grant No. 51525304 & 51173096) and the National Key Basic Research and Development Program of China (Grant No. 2015CB655002) for financial support. We are grateful to Dr. Zhen Cao, Dr. Yuan Li and Prof. Jean-Luc Bredas for a critical reading of the manuscript and helpful discussions. The computation in this research was performed on the "Explorer 100" cluster system of Tsinghua National Laboratory for Information Science and Technology. This work was also supported by CAS Interdisciplinary Innovation Team.

Publisher
Elsevier BV

Journal
Organic Electronics

DOI
10.1016/j.orgel.2016.03.016

Permanent link to this record