Photo diode
Semi conductor measuring or converting light into electrical current, commonly used in scanners and CCD's
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Gallium Photo Diode. Metering cells for measuring exposure, using gallium arsenide-phosphide, just like SPD or Cds cells.
Grain. ...
SPD
Silicon Photo Diode. Battery powered light sensitive cells - the most common light reading cells for cameras, external metering devices.
With the advent of electrically controlled diaphragms and shutters other light sensors like photo resistors, photo diodes etc. became common parts in cameras. Both sorts of devices needed batteries for operation.
 See also: Light, Digital, Camera, Exposure, Stand
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