Mobility
The mobility is a quantity related to the drift velocity of electrons or holes in an applied electric field across a material. The mobility depends on different scattering processes that can decelerate the free carriers, like collisions with the lattice or scattering at crystal defects and impurities.
\(\cfrac{1}{\mu} = \cfrac{1}{\mu_{lattice}} + \cfrac{1}{\mu_{impurities}}\)
Hence the mobility depends on the doping and defect density as well as the injection level. In our simulations and measurements we usually apply the model of DORKEL and LETURQUE [1].
[1] J. M. Dorkel and P. Leturcq, Solid-State Electronics 24, 821-825 (1981)
Fig. 1: mobility for electrons and holes versus injection for different doping concentrations
