Enhancing performance of fullerene-based organic electrochemical transistors via side-chain engineering  

作　　者：Wenxin Fang Zijie Li Chengdong Wang Xiaowei Zhao Junyu Li Gang Ye Fengwei Huo Li Qiu Yanxi Zhang Wei Huang 

机构地区：[1]Institute of Flexible Electronics(IFE,Future Technologies),Xiamen University,Xiamen 361005,China [2]Yunnan Key Laboratory of Electromagnetic Materials and Devices,National Center for International Research on Photoelectric and Energy Materials,School of Materials and Energy,Yunnan University,Kunming 650091,China [3]Sinopec Shanghai Research Institute of Petrochemical Technology,Shanghai 201028,China [4]Key Laboratory for the Green Preparation and Application of Functional Materials,Hubei Key Laboratory of Polymer Materials,School of Materials Science and Engineering,Hubei University,Wuhan 430062,China [5]Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing Tech University(NanjingTech),Nanjing 211800,China [6]Frontiers Science Center for Flexible Electronics,MIIT Key Laboratory of Flexible Electronics(KLoFE),Northwestern Polytechnical University,Xi'an 710072,China

出　　处：《Nano Research》2025年第2期905-912,共8页纳米研究(英文版)

基　　金：We acknowledge funding from the National Natural Science Foundation of China(Nos.22303071 and 51962036).

摘　　要：The performance of organic electrochemical transistors(OECTs)relies on the interaction between organic semiconductors and ions.Consequently,hydrophilic ethylene glycol(EG)side chains are incorporated into organic semiconductors to improve the channel’s capacity to absorb ions.However,the EG substituted organic semiconductors tend to swell when immersed in aqueous electrolytes and exhibit microstructural changes induced by dopant ions.In our research,we introduce an alkyl spacer to create distance between the fullerene and EG chain.This approach is designed to reduce the negative effects of swelling and balance the ion and electron conduction.We conducted an analysis of OECTs using four fullerene derivatives:no alkyl spacer,butyl,hexyl,and octyl spacers.The OECTs based on fullerene derivatives with butyl and hexyl spacers exhibit enhanced transconductance(g_(m)=11.8 and 19.4 mS)compared to the ones without alkyl spacers.It has also been observed that the butyl and hexyl spacers lead to a more than tenfold increase in volumetric capacitance.Further increasing the alkyl spacer(octyl group)leads to no transistor behavior.Our study uncovers the relationship between alkyl spacers and the performance of OECTs based on fullerene derivatives.This will serve as a guideline for designing n-type small molecules for OECTs.Finally,we showcased the potential of utilizing OECTs based on these fullerene derivatives in cation sensing,which is promising for developing sweat sensors.

关 键 词：organic electrochemical transistors fullerene derivatives ethylene glycol side chains ion and electron conduction 

分 类 号：O62[理学—有机化学]