Abstract
Flexible photodetectors are thought to have uses in optoelectronics, biological imaging, and smart wearable systems. The goal of this work was to develop a simple and low-cost method for fabricating a flexible infrared photodetector based on a lead sulfide (PbS) thin film produced on a PET substrate utilizing a simple low-temperature spray pyrolysis technique. The device has a highest sensitivity to infrared light (562%), a high responsivity (1.06 mA/W), and a short response time (1 ms) at an intensity of 1.72 mW/cm2. During 100 bending tests at a 40° angle, the performance of this flexible devices showed no signs of significant deterioration. The device exhibits a good, reproducible, and steady photoresponse even after bending (under tensile strain). This implies that this Ag/PbS-PET/Ag photodetector will find uses in wearable technology that require the detection of infrared radiation.
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