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Featured Article. Please see our HPLC PDA Detector section to find manufacturers that sell these products. Photodiode array detectors âvariously abbreviated as âPDA detectorsâ or simply âDADsââare essentially spectrophotometers that transiently measure the absorbance of light by a liquid flowing past.
Photodiode. a semiconductor diode characterized by unidirectional photoconductivity when exposed to optical radiation. A photodiode is a semiconductor crystal that usually has p-n junction with two metal terminalsâone from the p-region and the other from the n-regionâand is enclosed in a metal or plastic housing.Photodiodes are made of such materials as Ge, Si, GaAs, or HgCdTe.hen operating in the first mode, a photodiode is used as a photoconductive cell to control the electric current in a circuit in accordance with the variation in the intensity of the incident radiation.