Simple and Productive Method to Develop Highly Sensitive and Fast Infrared Photodetector Using Spray Deposited Nanocrystalline PbS Thin Film

Abstract This work demonstrates the development of a highly sensitive and fast infrared photodetector using PbS thin film deposited simple scalable method known as “spray pyrolysis”. An aqueous precursor solution was on glass substrate at 150 °C have cubic phase PbS. Silver electrodes with 1 mm gap are drawn to create photo-detector devices. Low resistive contact between silver electrode is revealed from linear I-V measurements performed in dark under light illumination. Under illumination 100-watt tungsten lamp, photo-responsivity, sensitivity, response time, decay time were measured. The Ag/PbS/Ag device has responsivity 70 mA/W, sensitivity 200 30 V, best times 6.4 15.6 ms, respectively. produced by this low-cost fabrication time.