What Is Photoconductive Cell?

: a photoelectric cell utilizing photoconductivity (as in a layer of selenium) so that an increase in illumination causes a decrease in electrical resistance and permits the flow of a greater electrical current.

What is a photoconductive cell used for?

Photoconductive cells are used to switch transistors on and off, as illustrated in figure. When the cell shown in figure is dark, the transistor base is biased above its emitter level, and the device is turned on.

What is principle of photoconductive cell?

It is based on the principle that the resistance of certain semiconductors materials decreases when they are exposed to radiations. In others words such material have high dark resistance and low irradiated resistance. ... These charge carriers are created within the material and reduce its resistance.