2001/09/30 by Yohai Roichman, Nir Tessler
Physics and Astronomy · #cond-mat.stat-mech
paper · pdf · doi:10.1063/1.1461419
published as Applied Physics Letters (80) 11, 1948 (2002)
arxiv created 2004/02/03 · arxiv updated 2009/11/30
The ratio between mobility and diffusion parameters is derived for a Gaussian-like density of states. This steady-state analysis is expected to be applicable to a wide range of organic materials (polymers or small molecules) as it relies on the existence of quasi-equilibrium only. Our analysis shows that there is an inherent dependence of the transport in trap-free disordered organic-materials on the charge density. The implications for the contact phenomena and exciton generation rate in light emitting diodes as well as channel-width in field-effect transistors is discussed.