THE SURFACE RECOMBINATION SPEED MODEL
Often all these various transport possibilities at an interface are modeled by using the following two expressions,3 which are linear in the carrier population:
The parameters Sn and Sp characterize this interface and are called surface recombination speeds. The sign choices seen in these equations depend on whether the interface is to the left or right of x as seen in Figure 5.20.
Equation 2.37 can be rigorously put into this from by rewriting it as
which can be used to show that a surface recombination speed of ——107 cm/s adequately represents thermionic emission. Equation 2.39 can be put into the form of Eq.