Tech Note 303 Detail
photodiode cathode material
AP-9368 h/e Photoelectric Head
What material is the h/e System's photodiode made of?
The cathode of the photodiode is formed by treating an evaporated layer of antimony with cesium vapor at 170 degrees C, resulting in what is believed to be a semiconductor Cs(3)Sb (Cesium-Antimony). This photocathode is characterized by a high sensitivity in the visible spectrum and a low work function.
The anode of the photodiode is a nickel alloy.
We have measured an average work function of 1.36 +/- 0.08 eV.
Creation Date: 12/5/2001
Last Modified: 10/10/2003