Photonegative
[foh-tuh-neg-uh-tiv] /ˌfoʊ təˈnɛg ə tɪv/
adjective, Physics.
1.
pertaining to a substance, as selenium, having a conductivity that decreases upon absorption of electromagnetic radiation.
/ˌfəʊtəʊˈnɛɡətɪv/
adjective
1.
(physics) (of a material) having an electrical conductivity that decreases with increasing illumination
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