Wide-range work function tuning in gold surfaces modified with fluorobenzenethiols toward application to organic thin-film transistors
Wide-range work function tuning in gold surfaces modified with fluorobenzenethiols toward application to organic thin-film transistors
复制标题
用氟苯硫醇修饰的金表面的大范围功函数调谐，用于有机薄膜晶体管
DOI：
10.1088/2058-8585/ab71e3
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发表时间：
2020
影响因子：
3.1
通讯作者：
Kitamura Masatoshi
中科院分区：
文献类型：
--
作者：
Yoshioka Takumi;Fujita Hiroki;Kimura Yoshinari;Hattori Yoshiaki;Kitamura Masatoshi
本文通过测量其功函数和接触角，系统地研究了含氟苯乙醇衍生物修饰金电极的表面性质。在邻位、间位和/或对位上含有氟原子的苯硫醇衍生物被用于本工作的修饰。测量的功函数范围在4.24 ~ 6.02 eV之间。用量子化学计算得到的偶极矩原理解释了裸露金表面的功函数变化。水接触角在64.8 ~ 97.7之间变化。根据测定的水与乙二醇的接触角计算了表面张力。从苯乙醇衍生物中取代物位置的角度对计算得到的表面张力进行了评述。此外，用2-氟苯硫醇（2-FBT）、3-氟苯硫醇（3-FBT）或五氟苯硫醇（PFBT）修饰漏极和源极的有机薄膜晶体管（TFTs）被表征为对修饰金表面的其他评价。TFT的接触电阻依次为PFBT、3-FBT和2-FBT。接触电阻的增大与功函数的减小一致。
Surface properties of Au electrodes modified by benzenethiol derivatives with a fluorine atom (s) have been methodically researched based on measurements of the work function and the contact angles. Benzenethiol derivatives with a fluorine atom (s) at ortho, meta, and/or para position were used for modification in this work. The measured work function was in a relatively wide range between 4.24–6.02 eV. The work function change from a bare Au surface was explained on the principle of dipole moments obtained by quantum chemical calculation. The water contact angle was found to vary between 64.8 and 97.7. Furthermore, the surface tension was calculated from the measured contact angles of water and ethylene glycol. The calculated surface tension was reviewed from the perspective of the position of the substitute in the benzenethiol derivative. In addition, organic thin-film transistors (TFTs) with drain and source electrodes modified with 2-fluorobenzenethiol (2-FBT), 3-fluorobenzenethiol (3-FBT) or pentafluorobenzenethiol (PFBT) were characterized as other evaluations of the modified Au surface. The contact resistance in the TFT increased in the order of PFBT, 3-FBT and 2-FBT. The increase of the contact resistance was consistent with the decrease in the work function.