DOI: https://doi.org/10.29363/nanoge.liv-act.2022.010
Publication date: 8th September 2022
Organic bioelectronics has experienced significant growth over the past twenty years due to the increasing attention to the design and synthesis of innovative organic smart materials that allowed the development of a plethora of devices suitable for both electrical recording and stimulation[1]. Among all bioelectronics devices, organic transistors emerge as one of the most promising platforms allowing a wide range of applications from electrophysiological signal recording to chemical and biological sensing and neuromorphic devices[2]. In the last decade, efforts have been devoted to the fabrication of photoresponsive remote-controllable devices capable of modulation of the output signal, with potential applications ranging from non-volatile memory devices to logic gates and photodetectors[3]. Indeed, the integration of photoswitchable molecules into Organic Field Effect Transistors (OFETs) and Organic Thin Film transistor (OTFTs) has been already explored suggesting a new and sensitive methodology for tuning the detectable electrical signals depending on the conformational changes of the molecules [4] . The capability of a light-associated modulation of the output current has been demonstrated also for Organic electrochemical transistors (OECTs) showing the possibility to regulate the device response. However, few examples of photoresponsive OECTs are reported in literature and involve the use of metals, sophisticated nanostructures and tedious synthetic approaches while the integration of photoswitchable molecules in OECTs architecture remains unexplored. In this work, a simple and effective synthesis of a light-responsive PEDOT:PSS bearing photoswitchable azobenzenes moieties (azo-tz-PEDOT:PSS) via Cu(I)-catalysed azide-alkyne Huisgen [3+2] cycloaddition (click reaction) has been reported. The full electrochemical and morphological characterization of this innovative material confirmed both its photodynamic behaviour and the electrical modulation induced by light irradiation. Moreover, the successful integration of the azo-tz-PEDOT:PSS in a fully organic OECT as a light-responsive planar gate has been also demonstrated.
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