Environmental Engineering Reference
In-Depth Information
Figure 8.8 Basic process of impact ionization, as observed in PbSe nanocrystals [106]. This process
is also involved in the germanium detector mentioned earlier.
Figure 8.9 Sketch of electron density of states
for ferromagnetic dilute magnetic
semiconductor AlP:Cr as suitable for a solar
cell [107]. AlP is a member of the GaAs family of
semiconductors and is capable of being doped
with Cr to become ferromagnetic. The narrow
level in the bandgap is a d-state of Cr. The
sketched bands (left side for spinup and right
side for spin down) have many of the properties
that were postulated for the intermediate band
solar cell. Adapted from Ref. [107], Figure 8.3.
