688 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1953 



and 



-fit) '''' 



dy 



If it is noted that the n-region and p-region Debye lengths are related 

 to the mean Debye length £ and the asymmetry parameter A by 



£n = A-^^^£ 

 and 



it is seen that (49)-(54) can be written: 



MO)^e-'''r— perccj, (49') 



ECD^e-^'^T— perjeJ, (520 



^ (0) « -he-' [— per £„ per £ J , (500 



dy 19 J 



^ (L) ^ -ie"' [— per £p per £ J , (530 



dy LQ. J 



-§^;^2e^^^ [times £„], , . 



^^^^ ^2e^/' [times £,^ 



Equations (490-(540 show that the maximum field intensity and the 

 "space charge layer thickness" at either extrinsic junction is dependent 

 only on the Debye length of the adjacent extrinsic material. 



Similarly, the concentrations of the majority carrier at either inter- 

 face is found to be substantially independent of U and L, and deter- 

 mined by the neighboring extrinsic material: 



^«e- (55) 



^«e-'. (50) 



