共价有机框架作为通道材料的有机电化学晶体管的制备及性能  

Preparation and performance of organic electrochemical transistors with covalent organic frameworks as channel materials

作　　者：王科 金达莱[1] WANG Ke;JIN Dalai(School of Materials Science&Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学材料科学与工程学院,杭州310018

出　　处：《现代纺织技术》2023年第5期117-124,共8页Advanced Textile Technology

基　　金：浙江省基础公益研究计划项目(LGG20E020001)。

摘　　要：有机电化学晶体管(OECT)由于具有器件制造简单、可拉伸、相对较低的工作电压和良好的开关电流比等优点,被广泛应用于生物医学、环境监测、保健产品、水处理和食品检测等领域。然而有机电化学晶体管材料往往受限于沟道材料的低化学稳定性以及低电子和离子迁移率等。共价有机框架(COF)由于具有稳定的共价键、良好的面内π-π共轭以及面外有序结构有望成为新一代的OECT沟道材料。文章通过一种表面引发方法在硅片表面原位生长COF薄膜,并用于OECT器件的组装,具有约100倍的开关比、0.4 V的低阈值电压和0.53 cm^(2)(V·s)的场效应迁移率。该研究结果为共价有机框架薄膜应用于电子器件领域拓宽了道路。While the past decade has witnessed remarkable advances in the field of organic bioelectronics,organic electrochemical transistors(OECTs)have been regarded as one of the most promising device platforms for this purpose.An OECT is a type of transistor where the source-to-drain current is electrochemically modulated by applying biases on the gate electrode.In comparison with other organic electronic devices,OECTs have several advantages,including simple device fabrication,strechability,relatively low operation voltages,and decent on-off current ratios.Accordingly,many researchers have developed various types of OECT-based bioe-lectronics with the capability of sensing DNAs,hormones,metabolites,and neurotransmitters,or of monitoring cells,tissues,or brain activities.To understand the mechanism of OECT device operation,the mixed transport of holes electrons and ions through an organic channel should be considered simultaneously.When an electrical bias is applied to the gate electrode,the conductivity of the organic layer is controlled by driving small cations(or anions)from the electrolyte medium to the channel layer,so as to dedope(or dope)the constituent organic conductor,resulting in the efficient modulation of source-to-drain current.In this regard,OECTs employ the whole volume of organic film as an effective channel,unlike typical organic field-effect transistors(OFETs)with the interface between semiconducting and dielectric layers functions as a major channel.From the perspective of engineering the channel microstructure,in-planeπ-πstacking among the conjugated moieties,as well as well-organized out-of-plane ordering,is highly desired to facilitate both intrachain and interchain transport of charge carriers along the channel direction.Meanwhile,porosity with micro nanoscopic voids and molecular-scale dispersion of ion-conductive moieties(e.g.,polyelectrolytes or ion-conductive side chains)should be uniformly distributed throughout the organic layer to enable facile permeation of small ions into the channel la

关 键 词：共价有机框架 有机电化学晶体管 离子浓度检测 沟道材料 纳米多孔材料 

分 类 号：TB34[一般工业技术—材料科学与工程]