Journal
ADVANCED ELECTRONIC MATERIALS
Volume 7, Issue 1, Pages -Publisher
WILEY
DOI: 10.1002/aelm.202000701
Keywords
anion‐ dependent materials; doping efficiency; ionic liquids; organic electrochemical transistors; triethylene glycol side chains
Funding
- NTU start-up grant [M4081866]
- Ministry of Education (MoE) under AcRF Tier 2 grant [2018-T2-1-075]
- A*STAR AME IAF-ICP Grant [I1801E0030]
- A*STAR AME Young Individual Research Grant [A1784c019]
- QUT
- QUT from the Australian Research Council (ARC) [FT130101337, QUT/322120-0301/07]
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A novel conjugated polymer PTDPP-DT was developed with polar triethylene glycol side chains to enhance ion penetration in OECTs, showing good electrical performance in aqueous electrolytes. The use of tetrafluoroborate (BF4-) anion allowed for efficient electrochemical doping of the polymer, resulting in high transconductance and good device stability over 500 cycles.
The increasing interest in organic electrochemical transistors (OECTs) for next-generation bioelectronic applications motivates the design of novel conjugated polymers with good electronic and ionic transport. Many conjugated polymers developed for organic field-effect transistors (OFETs) exhibit high charge carrier mobilities but they are not suitable for OECTs due to poor ion-uptake arising from the non polar alkyl chain substituted on the conjugated backbone. They are also sensitive to moisture, resulting in poor performance in aqueous electrolytes. Herein, the widely used conjugated building block diketopyrrolopyrrole (DPP) is used and functionalized it with polar triethylene glycol side chains (PTDPP-DT) to promote ion penetration. The electrical performance of PTDPP-DT based OECT in two types of aqueous electrolytes is studied and the electrochemical doping response is investivated. It is found that the tetrafluoroborate (BF4-) anion with large crystallographic radius allows high-efficiency electrochemical doping of the PTDPP-DT polymer, and thus gives rise to the high transconductance of 21.4 +/- 4.8 mS with good device stability, where it maintained over 91 % of its doped-state drain current after over 500 cycles of pulse measurement.
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