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Photodiodes usually have a slower response time as their surface area increases. The photo diode accepts light energy as input to generate electric current. Photodiode Wikipedia Photodiode Operation And Characteristics Photodiode Photodiode Theory Of Operation Optoelectronic Components As light detectors they are reverse biased the reverse current is linearly proportional to the illuminance striking the diode. Photodiode reverse light current . It is a form of light weight sensor that converts light energy into electrical voltage or current. Photodiode is a type of semi conducting device with pn junction. The current is generated when photons are absorbed in the photodiode. They are not as sensitive as a phototransistor. Between the p positive and n negative layers an intrinsic layer is present. In the feedback circuit you show the voltage dro...