The flexible and printed organic electronics stands out in the technological development scenario. Its main applications are on large-area devices, with low processability temperature and low production cost. Furthermore, it is desirable to fabricate these devices using materials and methods compatible with printing techniques. Among the most utilized electronic components, the transistor stands out due to its technological importance, being present in almost every electronic circuit. Recently, organic electrochemical transistors (ECTs) has received much attention. These devices have the advantage of operating at low-voltage and provide a high output current. Also, they can be fabricated over flexible substrates using printing methods. Electrochemical active materials with a high specific area are great candidates for applications in OECTs. The molybdenum disulfide (MoS2) is a semiconductor with a direct bandgap of 1.8 eV and can generate porous films with a high specific area. The poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT: PSS) is a conjugated polymer with conductive properties and a stable oxidized state. In this way, we proposed here the preparation and characterization of ECTs based on PEDOT: PSS/MoS2 composites deposited by spray over paper substrates. To summarize, we expect that this research project may contribute to the development of printed electronics by producing a high-performance device fabricated by a simple printing method.
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