Abstract
In this study, we developed polymer gate insulator-based organic phototransistors (p-OPTs) with improved optical switching properties by using a hybrid gate insulator configuration. The hybrid gate insulator of our p-OPT has a photoresponsive layer made of poly(4-vinylphenol) (PVP), which enhances the photoresponse, and an interfacial layer of poly(methyl methacrylate) for reliable optical switching of the device. Our hybrid gate insulator-equipped p-OPT exhibits well-defined optical switching characteristics because no specific type of charge is significantly trapped at an interfacial layer/organic semiconductor (OSC) interface. Moreover, our device is more photoresponsive than the conventional p-OPT (here, an OPT with a single-polymer poly(methyl methacrylate) (PMMA) gate insulator), because the characteristic ultraviolet (UV) absorption of the PVP polymer allows the photoresponsive layer and OSC to contribute to the generation of charge carriers when exposed to UV light.
Highlights
Organic phototransistors (OPTs) are three-terminal organic optoelectronics with an incident light that acts as the external electrode to tune the electrical signal
3.ofResults the polymer-based OPTs (p-OPTs), we fabricated two types of devices with different polymer gate insulators
organic semiconductor (OSC)/gate insulator of the p‐OPTs, we fabricated two types of devices with different polymer gate insulators
Summary
Organic phototransistors (OPTs) are three-terminal organic optoelectronics with an incident light that acts as the external electrode to tune the electrical signal. OPTs possess the advantages of organic electronics, such as low cost and mechanical flexibility, and an advantage of field-effect transistors (i.e., a relatively high signal-to-noise ratio) [1,2,3,4,5,6,7,8,9,10]. UV-sensing devices that possess the advantages of a p-OPT configuration (i.e., low cost, flexibility, and a relatively high signal-to-noise ratio), have the potential to become a core technology in the field of healthcare.
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