The effect of electrolyte gating on several solid state systems
Abstract/Contents
- Abstract
- Recently, electrolyte gating has become a popular technique in studying the carrier density dependent physical properties in solid state materials, due to its capability of producing large carrier density modulation. The mechanism of conductance control by electrolyte gating has been widely accepted to be an electric double layer (EDL) capacitor model, which was originally proposed by Helmholtz in the 19th century to describe the electrolyte-electrode interface. However, this EDL picture is known for a number of imperfections. In this thesis, we take two transition metal oxide materials, namely the perovskite SrTiO$_3$ and rutile TiO$_2$, as examples, to show that the imperfections of EDL picture could manifest themselves in the physical properties one observes, and therefore should be included in drawing physical conclusions on electrolyte gated materials. Specifically, we show that electrolyte gated SrTiO$_3$ (001) shows two distinct electromagnetic transport regimes, which is consistent with a percolation picture, and suggests that the charge distribution in the EDL can be disordered. We also show that electrolyte gating effect on TiO$_2$ rutile is facet dependent, and strongly correlated with the TiO$_2$ surface energies. Gating cycles on TiO$_2$ rutile (101) shows large electrolyte dependent hysteresis, which is a signature of specific adsorption and ion-surface interactions. We further show that oxygen vacancy formation is more likely to be the origin of conductance in electrolyte gated TiO$_2$ rutile, and possibly SrTiO$_3$ as well. Electrochemical process could play a significant role even at low gate voltages. We finally study the electrolyte gating effect in the environment of oxygen, and propose it as a potential technique in detecting oxygen vacancy formation in electrolyte gated oxides. A number of other incomplete projects related to electrolyte gating will also be presented.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2013 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Li, Mingyang |
|---|---|
| Associated with | Stanford University, Department of Physics. |
| Primary advisor | Goldhaber-Gordon, David, 1972- |
| Primary advisor | Harris, J. S. (James Stewart), 1942- |
| Thesis advisor | Goldhaber-Gordon, David, 1972- |
| Thesis advisor | Harris, J. S. (James Stewart), 1942- |
| Thesis advisor | Parkin, Stuart S. P |
| Advisor | Parkin, Stuart S. P |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Mingyang Li. |
|---|---|
| Note | Submitted to the Department of Physics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2013. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2013 by Mingyang Li
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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