well which is related to that the ρ
P in (b) provides more negative polarization charges
at the junction.
For F ¼ 1–7 MPa, the comparisons of the interface effective polarization charges
calculated from the linear analytical and nonlinear numerical solutions are shown in
Table 3.2. As F increases, the difference between the two solutions increases as
expected.
We now consider the case when the two ends of the rod at x ¼ ÆL are under an
applied voltage 2V with the following boundary conditions:
φ ÀL
ð Þ ¼ V, φ L
ð Þ ¼ ÀV:
ð3:213Þ
Our main interest is the current-voltage relation or IÀV curve. In view of the wellknown nonlinear behavior associated with the typical IÀV curves of a PN junction,
Fig. 3.30 Effects of a
medium F ¼ 0.1–1.0 MPa in
the heterogeneous junction.
(a) φ by COMSOL. (b) ρ
P
by COMSOL
3.14 Extension of a PN Junction
83