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Small-Molecule Mixed Ionic-Electronic Conductors for Efficient N-Type Electrochemical Transistors: Structure-Function
Yongjoon Cho1, Lin Gao1, Yao Yao1
1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113, USA.
Researchers developed new organic mixed ionic-electronic conductors (OMIECs) by adding oligoethyleneglycol (OEG) sidechains to Y6-type acceptors. The 3gY OMIEC demonstrated enhanced ion and electron transport, leading to improved device performance and bioelectronic applications.
Area of Science:
- Materials Science
- Organic Electronics
- Electrochemistry
Background:
- Optimizing simultaneous electron and ion transport is crucial for organic mixed ionic-electronic conductors (OMIECs).
- Existing Y6-type acceptors face challenges in balancing these transport properties.
Purpose of the Study:
- To synthesize and characterize novel OMIECs with systematically varied oligoethyleneglycol (OEG) sidechains.
- To investigate the impact of OEG density on the optoelectronic and electrochemical properties of OMIECs.
- To demonstrate the potential of these new OMIECs in organic electrochemical transistors (OECTs) and bioelectronic applications.
Main Methods:
- Synthesis and characterization of OMIECs with 1gY, 2gY, and 3gY sidechains.
- Evaluation of mixed ion-electron transport in conventional (cOECT) and vertical (vOECT) architectures.
- Crystallographic, optoelectronic, and electrochemical analyses.
- Fabrication and testing of small-molecule-based complementary inverters.
Main Results:
- All synthesized glycolated compounds (1gY, 2gY, 3gY) exhibited mixed ion-electron transport.
- 3gY achieved high transconductance (16.5 mS), a high on/off ratio (~10^6), and fast response times (94.7/5.7 ms) in vOECTs.
- Superior performance of 3gY was attributed to increased OEG content, optimized crystallinity, and enhanced film hydrophilicity.
Conclusions:
- Systematic introduction of OEG sidechains effectively enhances ion transport in OMIECs.
- 3gY represents a promising material for high-performance OECTs.
- These novel small-molecule OMIECs show significant potential for bioelectronic applications.
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