By tracking down the rapid motion of electrons in the material, they have been able to determine the diffusion length
-- how far electrons can travel without getting trapped by imperfections in the material -- as well as mobility -- how fast the electrons can move through the material.
The use of carbon nanotubes was chosen to create a back contact that is imbedded into the absorber layer, and thus decrease the diffusion length
to the back contact, which should result in a lower percentage of hole electron recombination, and hence higher efficiency," commented Natcore's CTO/co-founder Dennis Flood.
It is shown that for the characteristic diffusion length
scale of the eddies much smaller than the height of the Ekman bottom boundary layer the model results in an analytic expression for the vertical distribution of the concentration of suspended sediment, which includes both cases, with and without the lutocline.
Moreover, there is a correlation between the overlap parameter and the diffusion length
6, the point at which the S parameter reaches a maximum value can be related to the diffusion length
of the positrons in the polymer (marked by dashed lines a, b, and c).
where L is the electron diffusion length
calculated by [square root of (D[tau])] and q is the charge of an electron equal to 1.
The penetration depth of the thermal wave is determined by the thermal diffusion length
Surface photoelectric phenomena in bi-polar semiconductors with low diffusion length
Characterization: A number of techniques have been developed for the systematic study of the effect of the nature and density of dopants on properties such as minority carrier diffusion length
, conductivity, |4,5~ photoconductivity, |4,8~ majority carrier density and mobility.
Current products include the WT2000 bench top and WT3000 FOUP automated mapping tools with modules for the wafer mapping of microPCD lifetime, SPV diffusion length
, Q-V gate dielectric properties and JPV implant sheet resistance.
Hybrid organic-inorganic methylammonium lead halide perovskites have attracted intense attention for thin-film photovoltaics, due to their large absorption coefficient, high charge carrier mobility and long diffusion length
For such relatively small diffusion length
scales, the temperature over which chain diffusion occurs is effectively constant and the interface temperature is used as the appropriate diffusion temperature.