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Cyano-Functionalized n-Type Polymer with High Electron Mobility for High-Performance Organic Electrochemical
Kui Feng1,2, Wentao Shan2, Junwei Wang2
1Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong, 518055, China.
Advanced Materials (Deerfield Beach, Fla.)
|April 16, 2022
Summary
Researchers developed new n-type organic semiconductors by adding cyano groups to polymers. This significantly boosts electron mobility in organic electrochemical transistors (OECTs), advancing complementary circuits and biosensors.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- n-Type organic mixed ionic-electronic conductors (OMIECs) with high electron mobility are crucial for advanced electronic devices but remain challenging to develop.
- The performance of n-type organic electrochemical transistors (OECTs) lags behind their p-type counterparts, hindering the creation of low-power complementary circuits and sensitive biosensors.
Purpose of the Study:
- To synthesize and characterize novel n-type donor-acceptor (D-A) polymers for improved OECT performance.
- To investigate the impact of cyano functionalization on the properties of OMIECs and their application in n-type OECTs.
Main Methods:
- Synthesis of two D-A polymers: f-BTI2g-TVTCN (cyanated) and f-BTI2g-TVT (non-cyanated), utilizing fused bithiophene imide dimer (f-BTI2) and thienylene-vinylene-thienylene (TVT) units.
- Fabrication and characterization of n-type accumulation-mode OECTs using the synthesized polymers.
- Measurement of key performance metrics including volumetric capacitance (C*), electron mobility (μe,OECT), figure-of-merit (µC*), and normalized transconductance (gm,norm).
Main Results:
- The cyanated polymer f-BTI2g-TVTCN exhibited simultaneously enhanced ion-uptake, film structural order, and charge-transport properties compared to the non-cyanated version.
- f-BTI2g-TVTCN achieved a high volumetric capacitance of 170 ± 22 F cm⁻³ and a record OECT electron mobility of 0.24 cm² V⁻¹ s⁻¹.
- The cyanated polymer resulted in a state-of-the-art µC* of 41.3 F cm⁻¹ V⁻¹ s⁻¹ and gm,norm of 12.8 S cm⁻¹, significantly outperforming the non-cyanated polymer's µC* of 1.50 F cm⁻¹ V⁻¹ s⁻¹.
Conclusions:
- Cyano functionalization of polymer semiconductors is a powerful strategy for developing high-performance n-type OMIECs with substantial electron mobility in aqueous environments.
- The developed n-type OECTs show promise for applications in low-power electronics and advanced biosensing technologies.
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