DOI: https://doi.org/10.29363/nanoge.liv-act.2022.008
Publication date: 8th September 2022
Organic electrochemical transistors (OECTs) based on poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) are widely used in biosensors with high sensitivity. As a three-terminal device, they can be efficiently gated by non-polarizable electrodes such as Ag/AgCl. When appropriate gate or channel functionalization strategies are employed, they can be used for bio-sensing and bioelectronic readout applications. When used as implantable sensors, these devices would ideally operate fully wirelessly, being wirelessly powered, gated and having the ability for a wireless readout. Additionally, they should be fabricated on flexible and stretchable substrates and be able to conform well to differently shaped tissues. Organic photovoltaic (OPV) powered OECTs fabricated on flexible and stretchable substrates were previously reported [1]. Wireless readout strategies based on conventional technologies were also reported [2], however more reliable and practical readout technologies remain a worthy goal for the near future.
We will demonstrate our approach to wirelessly gating OECTs by gate electrode modified with an organic capacitively coupled photovoltaic-like stack based on a bilayer of metal-free phthalocyanine (H2PC) and N,N′-dimethyl perylenetetracarboxylic diimide (PTCDI), modified with PEDOT:PSS for increased electrode capacitance. We will show how said devices could be fabricated on 3D structured flexible and stretchable substrates and wirelessly powered by OPVs. In addition, we will propose wireless readout strategies which don't rely on complicated implanted electronic components.
This work has been supported by the Croatian Science Foundation under project UIP-2019–04–1753. We acknowledge the support of project CeNIKS, co-financed by the Croatian Government and the European Union through the European Regional Development Fund— Competitiveness and Cohesion Operational Programme (grant no. KK.01.1.1.02.0013), and the QuantiXLie Center of Excellence, a project co-financed by the Croatian Government and European Union through the European Regional Development Fund—the Competitiveness and Cohesion Operational Programme (grant no. KK.01.1.1.01.0004).
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