808 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1952 

 2.4 



2.0 2.4 2.8 



LOG - BOMBARDING 



Fig. 6— Photocurrent at a constant illuminance versus the bombarding voltage. 



on the photo active surfaces of the medium size cells whose spectral 

 response is given in Fig. 8. However, in order to show the rectifying prop- 

 erty of the barrier without the complication of a point contact, a disc of 

 hyper-purity silicon I5" in diameter and about 0.025" thick was given 

 an optical polish on both faces. One face was bombarded with 30-kv ions. 



10 



:: 



i 8 

 2 ^ 



o 



260 280 300 320 340 360 380 400 420 440 460 480 500 



TEMPERATURE IN DEGREES CENTIGRADE 



Fig. 7 — Photovoltage at a constant illumination versus temperature of the 

 bombarded silicon surface. 



