![]() Miniaturized power supply units tend to have a smaller environmental impact at the production stage than traditional electronics do integrated circuitry can miniaturize power supplies. Organic semiconductors increase the lifetime of large-area, low-cost image sensors by several thousand hours, and they monolithically integrate with photonic microsystems. Lifetime extension is an important eco-design strategy for mitigating the environmental burden of developing new devices. ![]() One is the internationalization of the restriction of hazardous substances and the waste of electrical and electronic equipment the other is a new directive especially for energy using products and the registration, evaluation, authorization, and restriction of chemicals. With the ever-increasing demand for eco-design, environmental legislation for electronics is focused on two major requirements. The dark current of the proposed light detector is lower than 9.23 nA and the linearity is approximately 1.15 μA/lux at an external resistance R SS = 10 kΩ and environmental temperatures from 25 ☌ to 85 ☌. Experimental results indicate that the maximum dark current of the proposed current amplifier is approximately 135 nA at 125 ☌, a near zero dark current is achieved at temperatures lower than 50 ☌, and dark current and temperature exhibit an exponential relation at temperatures higher than 50 ☌. This is advantageous in variable-temperature systems, especially for those with many infrared light-emitting diodes. The measured dark current of the proposed light detector is lower than that of the epichlorohydrin photoresistor or cadmium sulphide photoresistor. The light detector architecture comprises a photodiode for sensing the ambient light, a dark current diode for conducting dark current suppression, and a current subtractor that is embedded in the current amplifier with enhanced dark current cancellation. ![]() This paper presents a dark current suppression technique for a light detector in a variable-temperature system. ![]()
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