p-n Jl'XCTIOXS IX SKMICOXDICTOKS 4H9 



a, ^ (diuluctivity of intrinsic niatcrinl (4.15) 



fT„ = conductivity of //-region = (jbnii,, 



a^ = conductivity of /^-region = t/np^ 



T = time 



T„ , Tp = life times of electrons in /^-region and holes in //-region {M) {}.}>) 



(4.7) 

 7 7 = relaxation time of transition region, Ap{)endix IV 

 sT, v?,, , sf„ = Fermi level and quasi Fermi levels (2.2) (2.4) 

 hi- = applied voltage across specimen in forward direction, Section 2.3, 



(4.2) 

 X = sii\ D in Appendix \' 

 xp = electrostatic potential (2.2) 

 w = circular freciuency of a-c. (4.2) 



