Probing charge carrier properties in organic semiconductors with optical spectroscopy
Abstract/Contents
- Abstract
- Polymeric organic semiconductors (OSCs) have complicated, heterogeneous microstructures with significant nanoscale disorder. This thesis broadly shows how spectroscopic characterization via mid-Infrared charge modulation spectroscopy (CMS) and UV-Vis-NIR absorption provide powerful tools to understand disorder effects on electronic charge carriers. The first section shows how CMS spectra can be quantified to yield information on spatial localization of charge carriers, and then this quantification is expanded in the second section to focus on understanding charge transport in a modern, high-mobility OSC. In this section, it is shown that one-dimensional carrier delocalization along polymer chains (intrachain) is sufficient for good electronic charge transport, provided occasional, short-range contacts exist between polymer chains (interchain). Finally, the last two sections focus on understanding charge transport and carrier delocalization in electrolyte gated polymeric OSCs at high carrier densities exceeding one charge per ten monomers. In these sections, the importance of local, short-range intermolecular aggregates on charge transport is explored, and the remarkable result of charge carrier induced structural ordering via increasing polymer chain planarity is shown through a combined spectroscopic and X-ray scattering study. Overall, this thesis broadly shows that intrachain effects appear to dominate charge transport in polymeric OSCs.
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 | LeCroy, Garrett Swain |
|---|---|
| Degree supervisor | Salleo, Alberto |
| Thesis advisor | Salleo, Alberto |
| Thesis advisor | Mukherjee, Kunal, (Researcher in materials science) |
| Thesis advisor | Spakowitz, Andrew James |
| Degree committee member | Mukherjee, Kunal, (Researcher in materials science) |
| Degree committee member | Spakowitz, Andrew James |
| Associated with | Stanford University, School of Engineering |
| Associated with | Stanford University, Department of Materials Science and Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Garrett LeCroy. |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2023. |
| Location | https://purl.stanford.edu/ds555sx8058 |
Access conditions
- Copyright
- © 2023 by Garrett Swain LeCroy
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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