The effect of the donor moiety of DPP based polymers on the performance of organic electrochemical transistors
KAUST DepartmentBiological and Environmental Science and Engineering (BESE) Division
Organic Bioelectronics Laboratory
Permanent link to this recordhttp://hdl.handle.net/10754/670947
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AbstractOrganic mixed (ionic and electronic) charge conductors are the building blocks of state-of-the-art bioelectronic devices, including the organic electrochemical transistors (OECTs). Despite the interest in OECTs, the library of polymers that show efficient mixed charge transport is still narrow. In this work, we developed two donor–acceptor (D–A) type polymers based on the glycolated thiophene diketopyrrolopyrrole (TDPP) as the acceptor unit. We combined the acceptor with two donor units distinguished with different electron-donating strengths, i.e., a glycolated thienylenevinylene (gTVT) and a glycolated thiophene–benzothiadiazole–thiophene (gTBTT), leading to the polymers TDPP-gTVT and TDPP-gTBTT, respectively. Using spectral, gravimetric, structural, and electrical characterization techniques combined with density functional theory calculations, we sought to understand the effect of the donor unit on the mixed conduction performance of these D–A type polymers. We found that the stronger electron-donating nature of gTVT vs. gTBTT endowed TDPP-gTVT with a lower backbone curvature, leading to films with a tighter lamellar packing, and thereof, a higher degree of crystallinity compared to TDPP-gTBTT. The combination of a high product of electronic mobility and volumetric capacitance (μC* = 205 F cm−1 V−1 s−1) and a low threshold voltage (−0.36 V) rendered TDPP-gTVT based OECTs superior to TDPP-gTBTT devices. Our work introduces the selection of donor units with higher electron-donating power as a means to tune the film's microstructure, providing an effective approach to optimize mixed conduction properties of D–A type OECT materials.
CitationWang, Y., Hamidi-Sakr, A., Surgailis, J., Zhou, Y., Liao, H., Chen, J., … Yue, W. (2021). The effect of the donor moiety of DPP based polymers on the performance of organic electrochemical transistors. Journal of Materials Chemistry C. doi:10.1039/d1tc02994k
SponsorsThis work was supported by the National Research Foundation of China (Grant No. 21875291 and 21702240) and China Postdoctoral Foundation (Grant No. 2021M693580). S. I., J. S., and A. H.-S. acknowledge the support from KAUST.
PublisherRoyal Society of Chemistry (RSC)
JournalJournal of Materials Chemistry C
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