{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture16(1)

# A for 0 x p x xx 0 qn d for 0 x n qn d for xn 0 x xn

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 0 0 qN A for p p qN A for 0 x p x xx 0 qN D for 0 x n qN D for xn 0 x xn D 0 0 qNforx xfor x x and x x x n for p xn p and 0 for x x p and x x n thus, , thus thus, qN A qN A for x p for x p x x 0 0 qN A KK o for x S x0 p So KqNoD dE S qN dE for qN D D for 0 0 x x x n n dE dx KK o for 0 x x x S dx n So dx 0 0Kforo x x x x and x x x n S for p xn p and 0 for x x p and x x n Fig. 5.9 a a and b Fig. 5.9 and b Fig. 5.9 a and b Where we have used: Where we have used: dE Ks: Dielectric Constant Where dx dE K used: we have Ks: Dielectric Constant dE dx K Georgia Tech S Georgia Tech Georgia Tech dx KS o S o o EE ECE 3080 - Dr. Alan Dooli ECE 3080 - Dr. Alan Do ECE 3080 - Dr. Alan 332 Spring 2013 Dooli Movement of electrons and holes when forming the junction Electric Field in Depletiontep Junction Solution Region Depletion Region Approximation: S E ( x) 0 x dE ' xp qN A dx' KS o qN A x KS o E ( x) xp for for xp xp x x 0 0 and 0 E ( x) dE ' E ( x) xn x qN D dx' KS o qN D xn KS o x for 0 x xn for 0 x xn Since E(x=0-)=E(x=0+) NAxp=NDxn Georgia Tech ECE 3080 - Dr. Alan Doolittle EE 332 Spring 2013 Depletion Region Approximation: Step Junction Solution M dV E ovement of electrons and holes when forming the junction dx Depletion Region Approximation: Step Junction Solution dV V=VBi E qN A dx x p x for x p x 0 dV KS o V=VBi dxqN A qN D x x for 0 x x n n xp K S o x for x p x 0 dV KS o V=0 dx or , qN D x x for 0 x x n n ) V ( xK S o x qN A dV ' x p x' dx' for x p x 0 V=0 xp K or , 0 So V ( x) x qNnA qN D VBi x dV ' dV ' x p xx' dx'' dx'forforx0p xx x0 x n n 0 xp K x V ( x) K SoSo VBi xn qN D qN A x x' dx' for 0 x x 2 dV ' n n xp x for x p x 0 V ( x) xK 2SK So o V ( x) qN A qN 2 2 x p Dx x n for x for 0 x0 x n x Vbi x p 2K S 2K S...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online