Chemistry Reference
In-Depth Information
decreases (Fig. 8.52). As shown in Figs. 8.52 and 8.53, except for highly doped
materials,
n
type generally has a higher PS density than
p
type.
4. PS density of
n
-Si decreases with increasing illumination intensity as shown
in Fig. 8.53.
36
5. For a given material the dependence of porosity on various factors is similar
to that of pore diameter.
6. PS density tends to decrease with increasing anodization time or increasing
PS thickness mainly due to chemical dissolution of PS (Fig. 8.51).
12,41,48,287,1133
Specific surface area is the total physical area per unit volume (e.g.,
measure of the dispersion of the solid silicon in PS. In contrast to PS density, which is
), and is a
