Well-balanced ambipolar DPP-based copolymers for organic circuits

Until now, conjugated polymers with easily tuned optoelectronic properties have shown great applications in various fields, including organic field-effect transistors (OFETs), organic light-emitting diodes (OLEDs) and organic photovoltaic cells (OPVs). Particularly, OFETs as electrical switches are the most significant component for organic circuits and other related organic integrated (opto)electronic devices.

Over the past years, significant advances have been achieved for DPP-based p-channel and n-channel polymer semiconductors. However, the conjugated polymers with intrinsically balanced ambipolar properties are limited, which hinder the exploration of organic circuits.

Very recently, by utilizing F···S conformation lock, Prof. Dr. Huan-Li Dong in the Institute of Chemistry, CAS, designed a novel asymmetric thiophene/pyridine-flanked diketopyrrolopyrrole-based copolymer (PPyTDPP–2FBT), which exhibits typical V-shaped ambipolar field-effect transfer characteristics with well-balanced hole and electron mobilities of 0.64 and 0.46 cm²/(V s), respectively.

Furthermore, organic digital and analog circuits such as inverters and frequency doublers are successfully constructed based on solution-processed films of the PPyTDPP–2FBT copolymers which show a typical circuit operating mode with a high gain of 133 due to the well-balanced electrical properties. In addition, PPyTDPP–2FBT-based devices also demonstrate good stability and batch repeatability, suggesting their great potential applications in organic integrated electronic circuits.

See the article:

Yang J, Liu Q, Hu M, Ding S, Liu J, Wang Y, Liu D, Gao H, Hu W, Dong H. Well-balanced ambipolar diketopyrrolopyrrole-based copolymers for OFETs, inverters and frequency doublers. Sci. China Chem., 2021, 64, DOI:10.1007/s11426-021-1037-3.

https://doi.org/10.1007/s11426-021-1037-3

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