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L. G. WANG1,* , Y. X. GAO1, X. L. LIU1, L. F. CHENG1
- School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo, 454000, People’s Republic of China
A systematic study of the charge transport and electrical properties in the organic small-molecule material N,N’-bis(1-naphthyl)-N, N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) has been performed. We show that the thickness dependent current density versus voltage characteristics of NPB hole-only devices can be accurately described using our recently introduced improved mobility model based on both the Arrhenius temperature dependence and non-Arrhenius temperature dependence. For the material studied, we find the model parameters of the width of the density of states 0.14 eV and the lattice constant a 1.6 nm. Furthermore, we show that the boundary carrier density has an important effect on the current density versus voltage characteristics. Too large or too small values of the boundary carrier density lead to incorrect current density versus voltage characteristics. The numerically calculated carrier density is a decreasing function of the distance to the interface, and the numerically calculated electric field is an increasing function of the distance to the interface. Both the maximum of carrier density and the minimum of electric field appear near the interface..
Charge transport, Electrical properties, Organic small-molecule semiconductor.
Submitted at: Oct. 31, 2015
Accepted at: June 9, 2016
L. G. WANG, Y. X. GAO, X. L. LIU, L. F. CHENG, Charge transport and electrical properties in the organic small-molecule material NPB, Journal of Optoelectronics and Advanced Materials Vol. 18, Iss. 5-6, pp. 504-508 (2016)
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