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Study on charge transport in amorphous TCTA: an improved mobility model and its numerical simulation

L. H. LUO1,* , L. G. WANG1, H. L. XIAO1, L. M. ZHAO1

Affiliation

  1. College of Electronic & Information Engineering , Guangdong Ocean University, Zhanjiang, 524088, People’s Republic of China

Abstract

An accurate model for the carrier mobility of amorphous organic semiconductors is crucial for describing the characteristics of electronic devices. Although the original extended Gaussian disorder model (EGDM) effectively describes the dependence of mobility on temperature and carrier concentration, and simplifies the lattice structure, certain limiting conditions do not align with established assumptions, leading to errors. Therefore, this paper develops an improved model that not only addresses the aforementioned limitations but also calculates the carrier mobility within the simulation framework by solving the master equation. A universal and concise formula is derived to describe the charge mobility through the Marcus hopping mechanism in a disordered energy environment composed of Gaussian density of states (DOS), with parameters determined by precise numerical results. Research on the small-molecule organic semiconductor TCTA shows that experimental data are highly consistent with the results fitted by the improved model. Furthermore, the enhanced mobility model uses a calibrated effective temperature instead of the actual temperature, increasing its dependence on the electric field, and thereby more accurately reflecting the hopping transport laws of disordered organic semiconductors through random spatial positions. Finally, using this improved method, the distribution characteristics of charge carrier density and electric field in TCTA within polymer layers are analyzed in detail..

Keywords

Molecular semiconductors, Improved model, Electric field, Effective temperature.

Submitted at: July 26, 2024
Accepted at: Dec. 4, 2025

Citation

L. H. LUO, L. G. WANG, H. L. XIAO, L. M. ZHAO, Study on charge transport in amorphous TCTA: an improved mobility model and its numerical simulation, Journal of Optoelectronics and Advanced Materials Vol. 27, Iss. 11-12, pp. 562-573 (2025)