The role of contacts and interfaces on the performance of perovskite solar cells
Abstract/Contents
- Abstract
- With business as usual, our planet is expected to warm by over 4°C in the next 80 years. Those four degrees mean more chaotic weather, increased food scarcity, unprecedented flooding, and the many other impacts of global warming. To curtail these impacts requires a rapid expansion of carbon-free and renewable energy, and one promising source of that energy is perovskite solar cells -- a novel photovoltaic technology that despite its nascence has already surpassed power-conversion efficiencies of 22%. The halide perovskites of focus for solar applications are unique in their tolerance of many ionic defects. This property results in mixed electronic-ionic conduction, that requires new design rules and new models of understanding for perovskites used in solar cells. This work presents advances in understanding interfaces and optimizing contacts with the aim of closing the gap between the thin film properties of perovskites and their solar cell device efficiencies. First, I demonstrate how the presence of mobile ionic defects in perovskite solar cells changes the nature of perovskite-electrode interfaces, and therefore the impact of carrier-selective contacts on device performance. Translating this understanding of the impact of contact materials into contact design, I next present my results combining thermally evaporated organic molecules and atomic layer deposited vanadium oxide, to develop a contact with increased optical transparency and thermal stability for perovskite-silicon tandem solar cells. Finally, expanding on the impacts of ionic defects, I present a new understanding of photo-induced trap formation -- an energy loss-pathway that currently limits the power-conversion efficiency of many perovskite solar cells -- highlighting interfacial treatments as a pathway towards trap passivation and improved efficiency. Together, this work highlights the dynamic and impactful nature of perovskite interfaces, and how, by optimizing them, we can continue to advance the already remarkable efficiency of perovskite solar cells.
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 | 2018; ©2018 |
| Publication date | 2018; 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Belisle, Rebecca Anne |
|---|---|
| Degree supervisor | McGehee, Michael |
| Thesis advisor | McGehee, Michael |
| Thesis advisor | Lindenberg, Aaron Michael |
| Thesis advisor | Salleo, Alberto |
| Degree committee member | Lindenberg, Aaron Michael |
| Degree committee member | Salleo, Alberto |
| Associated with | Stanford University, Department of Materials Science and Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Rebecca Anne Belisle. |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Rebecca Anne Belisle
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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