Understanding the degradation of perovskite solar cells and engineering methods for improved stability
Abstract/Contents
- Abstract
- Within approximately a decade of their invention, organic-inorganic metal perovskite solar cells have reached power conversion efficiencies of 25%, which rival the market-dominant c-Si solar panels. The impressive power conversion efficiencies are attributable to its unique defect-tolerant optoelectronic properties. However, there is still much to be investigated with respect to the stability and lifetime of perovskites, which limits the path to commercialization. Perovskites are susceptible to degradation from many environmental stressors including heat, moisture, and UV light. To reach device lifetimes of greater than 10 years, which is necessary for perovskites to be competitive with other photovoltaic technologies, perovskite solar cells must be effectively encapsulated between two glass panels to prevent any ingress of moisture which causes premature failure. In this dissertation, I will discuss findings on the fundamentals of thermal degradation mechanisms in encapsulated perovskite solar cells. Based on these findings, a novel encapsulation scheme that reduces the thermal load of the solar cell is tested and evaluated in accelerated aging conditions of damp heat, dry heat, and outdoor aging. The development of an open-air plasma-deposition process for thin film moisture barriers is then presented as part of a cost-effective encapsulation scheme. The performance of the moisture barrier is assessed using both accelerated aging of perovskite solar cells and optical calcium testing to measure water vapor transmission rates through the barrier. Finally, capabilities for measuring the mechanical properties of ultra-thin (sub 10 nm) fluorosilane films which are used as an anti-fouling, hydrophobic coating for moisture-sensitive electronic devices, including perovskite solar cells are presented. From these measurements, insights are made regarding the influence of chemical precursor structure on the mechanical properties and durability of the film.
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 | 2021; ©2021 |
| Publication date | 2021; 2021 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Zhao, Oliver Kai |
|---|---|
| Degree supervisor | Dauskardt, R. H. (Reinhold H.) |
| Thesis advisor | Dauskardt, R. H. (Reinhold H.) |
| Thesis advisor | McIntyre, Paul Cameron |
| Thesis advisor | Salleo, Alberto |
| Degree committee member | McIntyre, Paul Cameron |
| 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 | Oliver Zhao. |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2021. |
| Location | https://purl.stanford.edu/td002zr8408 |
Access conditions
- Copyright
- © 2021 by Oliver Kai Zhao
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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