摘要
采用EuF3薄层修饰低功函数金属Ag源、漏电极,制备了CuPc有机场效应晶体管,研究了不同厚度EuF3对器件性能的影响。结果表明,EuF3的厚度由0 nm增至0.6 nm时,接触电阻由23.65×105Ω·cm减至3.86×105Ω·cm,使得器件载流子迁移率由1.5×10-3cm2·V-1·s-1提高到4.65×10-3cm2·V-1·s-1。UPS测试结果表明,薄层EuF3在Ag与有机半导体间形成了界面偶极势垒,使源漏电极表面功函数增大,空穴注入势垒降低,Ag电极与有机半导体层界面的接触电阻减小,进而提升了空穴的注入效率。
Europium fluoride (EuF3) was employed to modify the source and drain electrodes in CuPc based OFETs, in which they were fabricated by low work function metal Ag. The Influence of EuF3 with different thickness on devices was investigated. The contact resistance reduced from 23.65×105 Ω·cm to 3.86×105 Ω·cm as the thickness of EuF3 increased from 0 nm to 0.6 nm, which lead to an increased field-effect mobility from 1.5×10-3 cm2·V-1·s-1 to 4.65×10-3 cm2·V-1·s-1. The UPS results show that an interfacial dipole potential is formed between the silver electrodes and the organic semiconductor layer. It raises the surface work function of the source and drain electrodes and reduces the hole injection barrier, thus decreases the contact resistance and improves the hole injection efficiency.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2014年第2期238-242,共5页
Chinese Journal of Luminescence
基金
国家自然科学基金(61106057)资助项目
关键词
场效应晶体管
EuF3
修饰层
Contact resistance
Electrodes
Europium
Field effect transistors
Fluorine compounds
Organic field effect transistors
Silver
Ultrathin films
Work function
