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Switching p-type to high-performance n-type organic electrochemical transistors via doped state engineering

Peiyun Li1, Junwei Shi1,2, Zhen Huang2, Yuqiu Lei3, Ting Lei1*

1 School of Materials Science and Technology, Peking University, No.5 YiHeYuan Road, Haidian District, Beijing, P.R.China

2 College of Chemistry and Molecular Engineering, Peking University, No.5 YiHeYuan Road, Haidian District, Beijing, P.R.China

3 College of Engineering, Peking University, No.5 YiHeYuan Road, Haidian District, Beijing, P.R.China

* Corresponding authors emails: tinglei@pku.edu.cn
DOI10.24435/materialscloud:vs-79 [version v1]

Publication date: Sep 14, 2022

How to cite this record

Peiyun Li, Junwei Shi, Zhen Huang, Yuqiu Lei, Ting Lei, Switching p-type to high-performance n-type organic electrochemical transistors via doped state engineering, Materials Cloud Archive 2022.113 (2022), doi: 10.24435/materialscloud:vs-79.

Description

High-performance n-type organic electrochemical transistors (OECTs) are essential for logic circuits and sensors. However, the performances of n-type OECTs lag far behind that of p-type ones. Conventional wisdom posits that the LUMO energy level dictates the n-type performance. Herein, we show that engineering the doped state is more critical for n-type OECT polymers. By balancing more charges to the donor moiety, we could effectively switch a p-type polymer to high-performance n-type material. Based on this concept, the polymer, P(gTDPP2FT), exhibits a record high n-type OECT performance with μC* of 54.8 F cm⁻¹ V⁻¹ s⁻¹, mobility of 0.35 cm² V⁻¹ s⁻¹, and response speed of τon/τoff = 1.75/0.15 ms. Calculations and comparison studies show that the conversion is primarily due to the more uniform charges, stabilized negative polaron, enhanced conformation, and backbone planarity at negatively charged states. Our work highlights the critical role of understanding and engineering polymers’ doped states.

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External references

Journal reference
P.Li, J. Shi, Y. Lei, Z. Huang, T. Lei, Nat. Commun, X, X (2022) (submitted)
Preprint

Keywords

n-type organic electrochemical transistor doped state engineering

Version history:

2022.113 (version v1) [This version] Sep 14, 2022 DOI10.24435/materialscloud:vs-79