Investigating the stability of perovskite light-emitting diodes
<p>Metal halide perovskite semiconductors have recently attracted significant attention as a class of materials with huge potential for a wide array of optoelectronic applications. They have shown great promise as emitters in light-emitting diodes where they demonstrate emission wavelength tun...
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| Format: | Thesis |
| Language: | English |
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2020
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| _version_ | 1817932661854830592 |
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| author | Warby, J |
| author2 | Snaith, H |
| author_facet | Snaith, H Warby, J |
| author_sort | Warby, J |
| collection | OXFORD |
| description | <p>Metal halide perovskite semiconductors have recently attracted significant attention as a class of materials with huge potential for a wide array of optoelectronic applications. They have shown great promise as emitters in light-emitting diodes where they demonstrate emission wavelength tunability across the entire visible spectrum, narrow emission spectra and high EQEEL in excess of 20%. Despite this excellent performance they have poor operational stability, resulting in lifetimes of 250 hours in the best case.</p>
<p> In this thesis, I first investigate factors which govern the fabrication of efficient green-emitting perovskite LEDs through the implementation and study of different device structures and passivation strategies for green emitting perovskite LEDs. Following this, I investigate the use of 2D/3D perovskite heterostructures as a strategy for efficient green-emitting perovskite LEDs. I systematically alter composition and examine changes in carrier recombination and device performance. Additionally, I study the effect of different experimental protocols on reproducibility of 2D/3D devices which leads to the development of a novel hole injection layer which affords efficient and highly reproducible devices.</p>
<p>In the final experimental chapter, I study the effect of the composition of 2D/3D perovskite LEDs on stability. I demonstrate that the introduction of the cation phenylethylammonium into the perovskite is highly detrimental to operational stability. This leads to investigations into the drivers behind poor operational stability where I reveal that changes to radiative efficiency and charge injection are the primary factors, which is attributed to increased ionic mobility.</p> |
| first_indexed | 2024-03-06T20:38:16Z |
| format | Thesis |
| id | oxford-uuid:335ec9d1-5314-4bfa-81ab-c14dd57cf8ed |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-12-09T03:41:28Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | oxford-uuid:335ec9d1-5314-4bfa-81ab-c14dd57cf8ed2024-12-07T12:32:47ZInvestigating the stability of perovskite light-emitting diodesThesishttp://purl.org/coar/resource_type/c_db06uuid:335ec9d1-5314-4bfa-81ab-c14dd57cf8edOptoelectronicsCondensed matterNanostructured materialsLight emitting diodesEnglishHyrax Deposit2020Warby, JSnaith, H<p>Metal halide perovskite semiconductors have recently attracted significant attention as a class of materials with huge potential for a wide array of optoelectronic applications. They have shown great promise as emitters in light-emitting diodes where they demonstrate emission wavelength tunability across the entire visible spectrum, narrow emission spectra and high EQEEL in excess of 20%. Despite this excellent performance they have poor operational stability, resulting in lifetimes of 250 hours in the best case.</p> <p> In this thesis, I first investigate factors which govern the fabrication of efficient green-emitting perovskite LEDs through the implementation and study of different device structures and passivation strategies for green emitting perovskite LEDs. Following this, I investigate the use of 2D/3D perovskite heterostructures as a strategy for efficient green-emitting perovskite LEDs. I systematically alter composition and examine changes in carrier recombination and device performance. Additionally, I study the effect of different experimental protocols on reproducibility of 2D/3D devices which leads to the development of a novel hole injection layer which affords efficient and highly reproducible devices.</p> <p>In the final experimental chapter, I study the effect of the composition of 2D/3D perovskite LEDs on stability. I demonstrate that the introduction of the cation phenylethylammonium into the perovskite is highly detrimental to operational stability. This leads to investigations into the drivers behind poor operational stability where I reveal that changes to radiative efficiency and charge injection are the primary factors, which is attributed to increased ionic mobility.</p> |
| spellingShingle | Optoelectronics Condensed matter Nanostructured materials Light emitting diodes Warby, J Investigating the stability of perovskite light-emitting diodes |
| title | Investigating the stability of perovskite light-emitting diodes |
| title_full | Investigating the stability of perovskite light-emitting diodes |
| title_fullStr | Investigating the stability of perovskite light-emitting diodes |
| title_full_unstemmed | Investigating the stability of perovskite light-emitting diodes |
| title_short | Investigating the stability of perovskite light-emitting diodes |
| title_sort | investigating the stability of perovskite light emitting diodes |
| topic | Optoelectronics Condensed matter Nanostructured materials Light emitting diodes |
| work_keys_str_mv | AT warbyj investigatingthestabilityofperovskitelightemittingdiodes |