Abstract
Photochromic molecules have been recently adopted by many researchers for organic field-effect transistor (OFET) applications, since they offer the opportunity to achieve flexible-type ultraviolet (UV) light sensors with the advantages of organic material-based solution processes. Here, we present the novel usage of an azobenzene derivative in the gate dielectric layer of an OFET for highly sensitive and reliable UV sensing applications. Owing to the large change of capacitance caused by the reversible photoisomerization of azobenzene, the OFET device can modulate efficiently the current signal under UV and visible light. We found that the on-current was greatly amplified upon UV light irradiation with good photoresponsivity and photocurrent ratio and then fully returned to the initial state under visible light. In addition, the device shows a strongly linear relationship with the UV radiation intensity and repetitive on–off response in real-time UV sensing tests, thus being potentially applied in highly ...
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