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Tuning Mixed Conduction between Ionic and Electronic Transport in Blended OMIECs via Phase Separation and Selective
Qizhe Tang1, Isabelle Barwick2, Qi Han3
1Department of Materials Science and Engineering, Monash University, Monash University, Wellington Road, Clayton, Victoria 3800, Australia.
Morphology of organic mixed ionic-electronic conductors (OMIECs) critically impacts organic electrochemical transistor (OECT) performance. Tailoring OMIEC/polystyrene blends and porous films optimizes ion transport and device characteristics.
Area of Science:
- Materials Science
- Organic Electronics
- Nanotechnology
Background:
- Organic mixed ionic-electronic conductors (OMIECs) are crucial for organic electrochemical transistors (OECTs).
- Controlling OMIEC morphology is key to understanding and optimizing charge transport mechanisms.
Purpose of the Study:
- To investigate how blend and porous morphologies of OMIECs influence mixed ionic-electronic transport in OECTs.
- To compare the performance of OECTs fabricated with different OMIEC/polystyrene ratios and structures.
Main Methods:
- Fabrication of laterally phase-separated blend and porous OMIEC films using P3MEEET and P3MEEMT with polystyrene (PS).
- Characterization using spectroelectrochemistry (SEC), AFM, STXM, QCM, and GIWAXS.
- Performance evaluation of OECTs based on morphology.
Main Results:
- Blend morphologies enhance mobility (μ) and figure of merit (μC*).
- Porous films improve ion storage and effective volumetric capacitance (C*) due to hydrophilic OMIECs.
- Porous P3MEEMT samples show enhanced electrolyte side injection benefits.
Conclusions:
- Morphology plays a critical role in OMIEC-based OECT performance.
- Blend and porous structures offer distinct advantages for ionic and electronic transport.
- Understanding morphology-transport relationships enables rational design of advanced OECTs.
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