Dynamics in thin films measured with reflection-mode ultrafast infrared spectroscopy
Abstract/Contents
- Abstract
- Significant insights can be gained by studying the behavior of molecules in thin films. Many important processes in energy generation, chemical synthesis, gas capture, and tribology occur at interfaces. The properties of a chemical system near a surface are often different from those of the bulk material. Therefore, understanding interactions at surfaces is of great interest. In thin films, most or all of the molecules are close to the interface, providing a unique opportunity to measure the effect of the surface. In addition, thin films have many applications including solar cells, chemical sensors, and microelectronics components. In this work, two ultrafast infrared spectroscopy techniques, two-dimensional infrared spectroscopy and polarization-selective pump-probe spectroscopy, were applied to thin films to measure their molecular dynamics on the picosecond time scale. Spectroscopy experiments on thin films are challenging because of the small number of molecules present in the samples. To make the experiments feasible, the signal was enhanced by using a reflection-mode geometry instead of the standard transmission geometry. The chemical systems studied in this work were a two-dimensional perovskite and room temperature ionic liquids (RTILs). The perovskite experiments showed that the lattice undergoes rapid structural fluctuations, which may be relevant to perovskites' effectiveness at stabilizing charge carriers. The RTIL experiments showed that the effect of the interface propagates for tens of nanometers into the liquid, which is a notably large distance compared to the corresponding length scale in conventional liquids like water.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2023; ©2023 |
| Publication date | 2023; 2023 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Breen, John Patrick |
|---|---|
| Degree supervisor | Fayer, Michael |
| Thesis advisor | Fayer, Michael |
| Thesis advisor | Dai, Hongjie |
| Thesis advisor | Moerner, William |
| Degree committee member | Dai, Hongjie |
| Degree committee member | Moerner, William |
| Associated with | Stanford University, School of Humanities and Sciences |
| Associated with | Stanford University, Department of Chemistry |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | John P. Breen. |
|---|---|
| Note | Submitted to the Department of Chemistry. |
| Thesis | Thesis Ph.D. Stanford University 2023. |
| Location | https://purl.stanford.edu/yd235tr0219 |
Access conditions
- Copyright
- © 2023 by John Patrick Breen
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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