416 



BEI.I. SVSTI-:\I TKCIIXICAL JOIRXAL 



0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 



C |C 

 II 



0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 



Fig. 5 — Steady-state curve of hole density »a against distance .v, for the case of ideal 

 volume recomhination (recombination rate = «/,«e/rWo), and asymptotic approximations 

 to this curve. 



