Photoconductivity is an optional and electrical phenomenon in which a material becomes electrically conductive because of the absorption of electromagnetic radiation like visible light, ultraviolet light, infrared light, or gamma radiation.
The photoconductive cell has very high resistance in the dark called dark resistance. When illuminated the resistance falls. The spectral response of Cds cell is similar to that of the human eye. The electron pairs generated move in opposite directions. This results in photocurrent. Photoconductivity detects the presence of light and measure. Electrical resistance decreases when light falls on photoconductive substances.
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