The effective density of states are modeled according (3.33) and (3.34):

where is the number of the equivalent energy
minima. Table 3.12 gives the values of for the binary
semiconductors.
For the ternary semiconductors is composed using the effective masses. For the transition between an
indirect to a direct semiconductor ternary alloy (in a HEMT e.g. for AlGaAs with x= 0.45),
the following equation is used:

2001-12-21