Body: People who study "Photoelectronic devices" investigate the emission of electrons or other free carriers when light hits a material.
Why study "Photoelectronic devices"? make their own devices in the future.
Some subfields in "Photoelectronic devices" include Photomultipliers, Image sensors, Gold-leaf electroscope.
Nave, R, Haberkern, Thomas, and N Deepak are a few specialists of "Photoelectronic devices".