For the n-type region, (25) should be replaced by 



rlP 



^ = i(A + p-n) (25a) 



where 



1/2 



..©■" 



(29) 



For the p-type region, (25) should be replaced by 



^ = i(-A-' + i>-n). (25b) 



FORMAL SOLUTION OF EQUATIONS FOR INTRINSIC REGION 



Division of (25)-(27) by (28) yields, after evident rearrangements of 

 factors, 



(30) 

 (31) 

 (32) 



(33) 



(34) 



where A and Ax are constants of integration. The condition (11) that 

 ^ = f or p = n implies that 



Ai = A, 



Substitution of (33) and (34) into (30) yields 



% = ''^'-^-'' (35) 



= 2 A sinh ^. 



