"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Analysis of hole transport in a high-mobility conjugated polymer: evidence for the absence of correlated disorder

M. L. LIU1, L. G. WANG1,*

Affiliation

  1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo, 454000, People’s Republic of China

Abstract

The presence of spatial correlation between the site energies in organic semiconductors is known to affect the carrier mobili ty. However, it is not established whether such a correlation is present in relevant materials. In this paper, an analysis of the layer thickness and temperature dependence of the current density in hole-only devices based on a novel high-mobility n-type copolymer poly{[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diy1]-alt-5,5'-(2,2'-dithiophene)} [P(NDI2OD-T2),PolyeraActivInk™ N2200] is presented. Consistent descriptions with equal quality are 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, we view the more realistic intersite distance found using the EGDM (0.8 nm) compared to the value found using the ECDM (0.1 nm) as an indication that in N2200 correlations between the site energies are absent or play a minor role..

Keywords

Organic semiconductors, Hole transport,Correlated disorder.

Submitted at: Oct. 13, 2017
Accepted at: April 5, 2018

Citation

M. L. LIU, L. G. WANG, Analysis of hole transport in a high-mobility conjugated polymer: evidence for the absence of correlated disorder, Journal of Optoelectronics and Advanced Materials Vol. 20, Iss. 3-4, pp. 163-168 (2018)