In addition, the diffusion length is defined as:

In particular, the thickness of the base must be much less than the diffusion length of the electrons.

It also means that during recombination, the diffusion length changed dramatically, as the ionisation fraction shifted.

A long distance is one that is greater than the mean free path, if still less than the diffusion length.

If is time-dependent, the diffusion length becomes .

This idea is useful for estimating a diffusion length over a heating and cooling cycle, where D varies with temperature.

To enhance diffusion length (or carrier lifetime), a variety of organic materials are attached to the titania.

Dye-sensitized solar cell has a disadvantage of a short diffusion length.

The diffusion length is independent of any built-in fields in contrast to the drift behavior of the carriers.

In both cases the ratio of the diffusion length to the device dimensions determines the gain.