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Electron transport in a high-mobility conjugated polymer: the role of uncorrelated disorder and correlated disorder

X. L. WANG1, L. ZHANG2,* , L. A. KANG3, L. G. WANG2,*

Affiliation

  1. School of Physics &Electronic Information Engineering, Henan Polytechnic University, Jiaozuo, 454000, People’s Republic of China
  2. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo, 454000, People’s Republic of China
  3. Huaneng Henan Clean Energy Branch, Zhengzhou, 450016, People’s Republic of China

Abstract

In this paper, the electron transport and spatial correlation between the site energies in a high-mobility n-type conjugated polymer poly{[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diy1]-alt-5,5'-(2,2'-dithiophene)} (N2200) are investigated. It is found that consistent descriptions for the thickness dependent and temperature dependent current density versus voltage ( J V ) characteristics of N2200 electron-only devices can be obtained by using the extended Gaussian disorder model (EGDM) and the extended correlated disorder model (ECDM), within which the mobility depends on the electric field and carrier density and within which spatial correlations between the site energies are absent or are included. Based on a comparison of the model parameters as obtained from both models with the typical value of organic semiconductors, we find that the width of the Gaussian density of states from two models is considerably smaller than usually obtained for conjugated polymers and the intersite distance found using the ECDM (0.4 nm) is unrealistically small, which indicate a high electron mobility and a spatially uncorrelated Gaussian disorder in N2200, respectively.

Keywords

Electron transport, Uncorrelated disorder, Correlated disorder, Intersite distance.

Citation

X. L. WANG, L. ZHANG, L. A. KANG, L. G. WANG, Electron transport in a high-mobility conjugated polymer: the role of uncorrelated disorder and correlated disorder, Optoelectronics and Advanced Materials - Rapid Communications, 14, 7-8, July-August 2020, pp.372-376 (2020).

Submitted at: Jan. 29, 2020

Accepted at: Aug. 18, 2020