期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 22, 期 22, 页码 12395-12402出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp00423e
关键词
-
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- Japan Society for the Promotion of Science (JSPS)
When a metal is soaked in an electrolyte solution, the metal and solution affect each other through the formation of electric double layers (EDLs) at their interfaces. The EDLs at metal-electrolyte interfaces can realize high-density charge-carrier injections and accumulations, and thus have recently attracted attention for their potential application to energy storage, and electronic and electrochemical devices. In such EDL-based devices, including field-effect transistors (FETs), the potential energy of surface electrons in the metal electrodes (E-M) governs the transistor device performance. This is in clear contrast to redox-driven electrochemical devices such as dye-sensitized solar cells and electrochromic devices, whose performance is primarily governed by the potentials of the redox-active species. However, there has been no systematic research to bridge the distance between metal electrons and electrolyte ions. In the present study, we carefully examined the dependence of E-M of ITO, Au and Pt electrodes on the concentration of the PEG solutions of LiCl and MgCl2, because it has been well established that the chemical potential of electrolyte solutions is dependent on the solution concentrations. Our results showed that, at the same electrolyte concentration, the values of E-M increased in the order of ITO, Au and Pt; moreover, on the same electrode, E-M showed linear decreases as a function of the logarithm of the electrolyte concentrations. To understand these behaviors, we developed a theoretical treatment of the EDLs based on the simple Gouy-Chapman model, and obtained the theoretical expressions of E-M in terms of the concentration of electrolyte and the work function of the metal electrode (Phi(M)), which were found to successfully explain the dependences of E-M on the electrolyte concentration and the electrode materials. We also examined the EDL-FETs of platinum phthalocyanine (PtPc), with various LiCl-PEG solutions of different concentrations as gate electrolytes. The threshold voltage eV(T) and E-M exhibited a linear relation, which was well explained by the relation between E-M and the valence band energy E-VB of PtPc. The transfer characteristics at various gate voltage V-G were found to be well normalized by a function of eV(G) + E-M.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据