PR[\'CIPLES or TRAXSISTOR ACTION 



253 



increase of only about 2S i)er cent in a could be obtained by decreasing the 

 spacing below .005 cm. 



Figure 6 shows that the decrease of a with distance is dependent on the 

 germanium sample used. Curve 1 is similar to the results in Fig. 5. Curve 



o 



\- 

 < 



u. 



3 1.0 



a 



B 0-8 

 < 



Z 0.6 



LU 



cr 

 a. 



^ 0.4 



O.OtO 0.015 0.020 



SEPARATION IN CENTIMETERS 



0.030 



Fig. 5 — Dependence of current amplificat'on factor a on electrode separation. Po 

 sitions A and B as in Fig. 4. 



0, 

 . 2 



0.010 0.015 0.020 



SEPARATION IN CENTIMETERS 



Fig. 6 — Dependence of current amplification factor a on separation for germanium 

 surfaces from two ditTerent melts, 1 and 2. 



2 is for a germanium slice with the same surface treatment but from a differ- 

 ent melt. 



Figure 4 shows the corresponding results for R^^- There is an approxi- 

 mate inverse relationship between R12 and s. 



Another way to illustrate the decreased intluence of the emitter on the 

 collector with increase in spacing is to plot the collector characteristic for 

 fixed emitter current at different spacings. Figure 7 is such a plot for a 



