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A hybrid active pixel sensor (APS) was implemented for ultraviolet (UV) imagers by combining a metal–semiconductor–metal (MSM)-type GaN UV sensor and a standard Si CMOS APS controller. The photodetector region of the APS circuit was replaced by a GaN MSM UV sensor, and it was connected together on the printed circuit board with standard Si CMOS APS circuit chip. The dark and photoresponsive current...
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