New perspective on charge transport in molecularly doped systems

Huoy-Jen Yuh; David M. Pai

doi:10.1117/12.19811

1 July 1990 New perspective on charge transport in molecularly doped systems

Huoy-Jen Yuh, David M. Pai

Proceedings Volume 1253, Hard Copy and Printing Materials, Media, and Processes; (1990) https://doi.org/10.1117/12.19811
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

Abstract

Hole transport has been investigated in films of solid solutions of N,N'-diphenyl-N,N'- bis(3-methylphenyl)-[1, 1 '-biphenylj-4,4'-diamine (TPD), ETPD, a structural variant of TPD and a hydrazone molecule in two different polymer binders. Rather than being 'inert' as generally assumed, the binder plays a major role in influencing the rate of charge exchange between molecules. It is found that the absolute values of the drift mobilities, their electric field dependence and the activation energies are strong functions of the binder polymer employed to cast the film. At equivalent molecular concentrations but with two different binder polymers, the mobilities can vary by as much as two orders of magnitude. In some instances mobility decreases as the electric field is increased. The increased mobility of dispersions in polystyrene is directly related to the reduction in the activation energies. The role that binder plays may be related to the dispersibility of the diamine molecules in the polymeric binders.

Citation Download Citation

Huoy-Jen Yuh and David M. Pai "New perspective on charge transport in molecularly doped systems", Proc. SPIE 1253, Hard Copy and Printing Materials, Media, and Processes, (1 July 1990); https://doi.org/10.1117/12.19811

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