Plasmonic nanostructures and film crystallization in perovskite solar cells
<p>The aim of this thesis is to develop a deeper understanding and the technology in the nascent field of solid-state organic-inorganic perovskite solar cells.</p> <p>In recent years, perovskite materials have emerged as a low-cost, thin-film technology with efficiencies exceeding...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
2014
|
| Subjects: |
| _version_ | 1826310151253000192 |
|---|---|
| author | Saliba, M |
| author2 | Snaith, H |
| author_facet | Snaith, H Saliba, M |
| author_sort | Saliba, M |
| collection | OXFORD |
| description | <p>The aim of this thesis is to develop a deeper understanding and the technology in the nascent field of solid-state organic-inorganic perovskite solar cells.</p> <p>In recent years, perovskite materials have emerged as a low-cost, thin-film technology with efficiencies exceeding 16% challenging the quasi-paradigm that high efficiency photovoltaics must come at high costs. This thesis investigates perovskite solar cells in more detail with a focus on incorporating plasmonic nanostructures and perovskite film formation.</p> <p>Chapter 1 motivates the present work further followed by Chapter 2 which offers a brief background for solar cell fabrication and characterisation, perovskites in general, perovskite solar cells in specific, and plasmonics.</p> <p>Chapter 3 presents the field of plasmonics including simulation methods for various core-shell nanostructures such as gold-silica and silver-titania nanoparticles.</p> <p>The following Chapters 4 and 5 analyze plasmonic core-shell metal-dielectric nanoparticles embedded in perovskite solar cells. It is shown that using gold@silica or silver@titania NPs results in enhanced photocurrent and thus increased efficiency. After photoluminescence studies, this effect was attributed to an unexpected phenomenon in solar cells in which a lowered exciton binding energy generates a higher fraction of free charge. Embedding thermally unstable silver NPs required a low-temperature fabrication method which would not melt the Ag NPs. This work offers a new general direction for temperature sensitive elements.</p> <p>In Chapters 6 and 7, perovskite film formation is studied. Chapter 6 shows the existence of a previously unknown crystalline precursor state and an improved surface coverage by introducing a ramped annealing procedure. Based on this, Chapter 7 investigates different perovskite annealing protocols. The main finding was that an additional 130°C flash annealing step changed the film crystallinity dramatically and yielded a higher orientation of the perovskite crystals. The according solar cells showed an increased photocurrent attributed to a decrease in charge carrier recombination at the grain boundaries.</p> <p>Chapter 8 presents on-going work showing noteworthy first results for silica scaffolds, and layered, 2D perovskite structures for application in solar cells.</p> |
| first_indexed | 2024-03-07T07:46:17Z |
| format | Thesis |
| id | oxford-uuid:fdb36a9e-ddf5-4d27-a8dc-23fffe32a2c5 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:46:17Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | oxford-uuid:fdb36a9e-ddf5-4d27-a8dc-23fffe32a2c52023-06-07T10:26:52ZPlasmonic nanostructures and film crystallization in perovskite solar cellsThesishttp://purl.org/coar/resource_type/c_db06uuid:fdb36a9e-ddf5-4d27-a8dc-23fffe32a2c5NanomaterialsNanostructuresSemiconductor devicesAdvanced materialsSpray processingCondensed Matter PhysicsNumerical analysisEnglishOxford University Research Archive - Valet2014Saliba, MSnaith, H<p>The aim of this thesis is to develop a deeper understanding and the technology in the nascent field of solid-state organic-inorganic perovskite solar cells.</p> <p>In recent years, perovskite materials have emerged as a low-cost, thin-film technology with efficiencies exceeding 16% challenging the quasi-paradigm that high efficiency photovoltaics must come at high costs. This thesis investigates perovskite solar cells in more detail with a focus on incorporating plasmonic nanostructures and perovskite film formation.</p> <p>Chapter 1 motivates the present work further followed by Chapter 2 which offers a brief background for solar cell fabrication and characterisation, perovskites in general, perovskite solar cells in specific, and plasmonics.</p> <p>Chapter 3 presents the field of plasmonics including simulation methods for various core-shell nanostructures such as gold-silica and silver-titania nanoparticles.</p> <p>The following Chapters 4 and 5 analyze plasmonic core-shell metal-dielectric nanoparticles embedded in perovskite solar cells. It is shown that using gold@silica or silver@titania NPs results in enhanced photocurrent and thus increased efficiency. After photoluminescence studies, this effect was attributed to an unexpected phenomenon in solar cells in which a lowered exciton binding energy generates a higher fraction of free charge. Embedding thermally unstable silver NPs required a low-temperature fabrication method which would not melt the Ag NPs. This work offers a new general direction for temperature sensitive elements.</p> <p>In Chapters 6 and 7, perovskite film formation is studied. Chapter 6 shows the existence of a previously unknown crystalline precursor state and an improved surface coverage by introducing a ramped annealing procedure. Based on this, Chapter 7 investigates different perovskite annealing protocols. The main finding was that an additional 130°C flash annealing step changed the film crystallinity dramatically and yielded a higher orientation of the perovskite crystals. The according solar cells showed an increased photocurrent attributed to a decrease in charge carrier recombination at the grain boundaries.</p> <p>Chapter 8 presents on-going work showing noteworthy first results for silica scaffolds, and layered, 2D perovskite structures for application in solar cells.</p> |
| spellingShingle | Nanomaterials Nanostructures Semiconductor devices Advanced materials Spray processing Condensed Matter Physics Numerical analysis Saliba, M Plasmonic nanostructures and film crystallization in perovskite solar cells |
| title | Plasmonic nanostructures and film crystallization in perovskite solar cells |
| title_full | Plasmonic nanostructures and film crystallization in perovskite solar cells |
| title_fullStr | Plasmonic nanostructures and film crystallization in perovskite solar cells |
| title_full_unstemmed | Plasmonic nanostructures and film crystallization in perovskite solar cells |
| title_short | Plasmonic nanostructures and film crystallization in perovskite solar cells |
| title_sort | plasmonic nanostructures and film crystallization in perovskite solar cells |
| topic | Nanomaterials Nanostructures Semiconductor devices Advanced materials Spray processing Condensed Matter Physics Numerical analysis |
| work_keys_str_mv | AT salibam plasmonicnanostructuresandfilmcrystallizationinperovskitesolarcells |