SEMICONDUCTOR DEVICE PHYSICS AND DESIGN

APPENDIX E. BEYOND THE DEPLETION APPROXIMATION 545

-Wp +Wn

+qND

-qNA -qnn 0

+qpp 0

Figure E.1: Schematic of ap−njunction within the depletion approximation.

+eND

• eNA
  
  
  • enn 0
  
  
  
  

+epp

0

x

E

dE +eND

+ ep (ψ)

dx=

+

ε

dE -eNA

dx=

• ε

dE -eNA

dx=

ε

p^ dE eND− en (ψ)

dx=

+

ε

n

-Wp +Wn

Figure E.2: Schematic of ap-njunction within the Gummel correction to the depletion approxi-
mation