Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.009
Publication date: 18th July 2023
An organic photoelectrochemical transistor (OPECT) is an organic electrochemical transistor (OECT), where the output current is controlled by light. OPECT has promising performance in biosensing with transconductance improved up to the physical limit, enhancing sensor sensitivity. However, to render an OECT photosensitive, photoactive materials should be integrated into the device, relying on additional metals, sophisticated nanostructures, and tedious synthetic approaches. This study developed an all-in-one OPECT structure, where a single photosensitive polymeric mixed ionic-electronic conductor was used as the photoactive gate and the channel material. A range of n-type polymeric mixed conductors was studied to understand the material requirements. The OPECT performance was investigated by evaluating the photoelectrochemical characteristics in electrode configuration and inherent OECT properties in dark conditions. We find that the photovoltage induced by light mainly controls the OECT output, the extent of which is controlled by the lifetime of photoinduced species. Using photosensitive polymers with long exciton lifetimes is key to maximizing OPECTs performance for light-gated bioelectronic devices.
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