Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 9, Issue 14, Pages 4927-4934Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc00440a
Keywords
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Funding
- National Natural Science Foundation of China [22075001]
- Key-Area Research and Development Program of Guangdong Province [2019B010934001]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2021-skllmd-02]
- Beijing Natural Science Foundation [2192020]
- Clinical Medicine Plus X - Young Scholars Project, Peking University
- Fundamental Research Funds for the Central Universities
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [SC0019361]
- High-Performance Computing Platform of Peking University
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High-performance organic electrochemical transistors (OECTs) using donor-acceptor (D-A) conjugated polymers show promising potential, but their performance lags behind polythiophene systems. By engineering the backbone and side chain of a series of diketopyrrolopyrrole (DPP)-based D-A polymers, researchers achieved improved performance with high figure-of-merit and fast response time. This work highlights the complexity and systematic approach required for developing high-performance OECTs based on D-A polymers.
To date, high-performance organic electrochemical transistors (OECTs) have mostly been based on polythiophene systems. Donor-acceptor (D-A) conjugated polymers are expected to be promising materials for OECTs owing to their high mobility and comparatively low crystallinity (good for ion diffusion). However, the OECT performance of D-A polymers lags far behind that of the polythiophenes. Here we synergistically engineered the backbone and side chain of a series of diketopyrrolopyrrole (DPP)-based D-A polymers and found that redox potential, molecular weight, solution processability, and film microstructures all have a severe impact on their performance. After systematic engineering, P(bgDPP-MeOT2) exhibited the best figure-of-merit (mu C*) of 225 F cm(-1) V-1 s(-1), amongst the highest performance of the reported D-A polymers. Besides, the DPP polymers exhibited high hole mobility of over 1.6 cm(2) V-1 s(-1), leading to fast response OECTs with a record low turn-off response time of 30 mu s. The polymer also exhibited good operation stability with a current retention of 98.8% over 700 electrochemical switching cycles. This work reveals the complexity and systematicness in the development of D-A polymer based high-performance OECTs.
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