Tech Note 303 Detail

photodiode cathode material

Affected Products:

AP-9368 h/e Photoelectric Head

Problem/Symptom:
What material is the h/e System's photodiode made of?

PASCO Solution:

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
Mod Summary: