{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/157111"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/157111","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Optical Properties of Colloidal II-VI and III-V Semiconductor Nanocrystals: Single Nanocrystal Photon Correlation Spectroscopy","abstract":"Colloidal nanocrystals (NCs), also known as quantum dots, are nanometer-sized semiconductor crystalline structures comprised of thousands to tens of thousands of atoms placing them in a world between the molecular-sized and the bulk-sized world, allowing them to harness unique qualities from both. Colloidal NCs are used in many applications including light-emitting diodes (LEDs), photovoltaics (solar cells), lasers, transistors, photocatalysis, and many more. In this thesis, I investigate the optical properties of colloidal NCs, specifically InP/ZnSe/ZnS, CdSe/CdS/ZnS, and ZnSe/ZnS NCs using a combination of ensemble and single NC photon correlation spectroscopic techniques. In the first chapter, I introduce the photophysical properties of colloidal NCs and spectroscopic techniques relevant to my studies. In the second chapter, I determine the dominant photoluminescent line shape broadening mechanisms in single InP/ZnSe/ZnS and CdSe/CdS/ZnS NCs using temperature dependent photoluminescent spectroscopic techniques. In the third chapter, I investigate the coherent emissive properties of single InP/ZnSe/ZnS and CdSe/CdS/ZnS at cryogenic temperatures, demonstrating the longest coherence time measured in a colloidal NC system to date. In the fourth chapter, I develop an ensemble third-order correlation technique to elucidate the average single ZnSe/ZnS NC triexciton efficiency and dynamics. Finally, I propose future directions in the fifth chapter, including a fourth order correlation technique to resolve absolute energy information on timescales faster than CCDbase spectroscopic techniques, and an open-access photon correlation Monte Carlo toolkit with the aim of filling education gaps and provide the colloidal NC community with a database of analytical tools that will encourage a wider audience to engage with photon correlation spectroscopy.","abstract_html":"Colloidal nanocrystals (NCs), also known as quantum dots, are nanometer-sized semiconductor crystalline structures comprised of thousands to tens of thousands of atoms placing them in a world between the molecular-sized and the bulk-sized world, allowing them to harness unique qualities from both. Colloidal NCs are used in many applications including light-emitting diodes (LEDs), photovoltaics (solar cells), lasers, transistors, photocatalysis, and many more. In this thesis, I investigate the optical properties of colloidal NCs, specifically InP/ZnSe/ZnS, CdSe/CdS/ZnS, and ZnSe/ZnS NCs using a combination of ensemble and single NC photon correlation spectroscopic techniques. In the first chapter, I introduce the photophysical properties of colloidal NCs and spectroscopic techniques relevant to my studies. In the second chapter, I determine the dominant photoluminescent line shape broadening mechanisms in single InP/ZnSe/ZnS and CdSe/CdS/ZnS NCs using temperature dependent photoluminescent spectroscopic techniques. In the third chapter, I investigate the coherent emissive properties of single InP/ZnSe/ZnS and CdSe/CdS/ZnS at cryogenic temperatures, demonstrating the longest coherence time measured in a colloidal NC system to date. In the fourth chapter, I develop an ensemble third-order correlation technique to elucidate the average single ZnSe/ZnS NC triexciton efficiency and dynamics. Finally, I propose future directions in the fifth chapter, including a fourth order correlation technique to resolve absolute energy information on timescales faster than CCDbase spectroscopic techniques, and an open-access photon correlation Monte Carlo toolkit with the aim of filling education gaps and provide the colloidal NC community with a database of analytical tools that will encourage a wider audience to engage with photon correlation spectroscopy.","abstract_has_math":false,"creators":["Berkinsky, David"],"institution":"Massachusetts Institute of Technology","degree_name":"Doctoral","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. 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Colloidal NCs are used in many applications including light-emitting diodes (LEDs), photovoltaics (solar cells), lasers, transistors, photocatalysis, and many more. In this thesis, I investigate the optical properties of colloidal NCs, specifically InP/ZnSe/ZnS, CdSe/CdS/ZnS, and ZnSe/ZnS NCs using a combination of ensemble and single NC photon correlation spectroscopic techniques. In the first chapter, I introduce the photophysical properties of colloidal NCs and spectroscopic techniques relevant to my studies. In the second chapter, I determine the dominant photoluminescent line shape broadening mechanisms in single InP/ZnSe/ZnS and CdSe/CdS/ZnS NCs using temperature dependent photoluminescent spectroscopic techniques. In the third chapter, I investigate the coherent emissive properties of single InP/ZnSe/ZnS and CdSe/CdS/ZnS at cryogenic temperatures, demonstrating the longest coherence time measured in a colloidal NC system to date. In the fourth chapter, I develop an ensemble third-order correlation technique to elucidate the average single ZnSe/ZnS NC triexciton efficiency and dynamics. Finally, I propose future directions in the fifth chapter, including a fourth order correlation technique to resolve absolute energy information on timescales faster than CCDbase spectroscopic techniques, and an open-access photon correlation Monte Carlo toolkit with the aim of filling education gaps and provide the colloidal NC community with a database of analytical tools that will encourage a wider audience to engage with photon correlation spectroscopy."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph.D."]},{"key":"dc:title","label":"Title","values":["Optical Properties of Colloidal II-VI and III-V Semiconductor Nanocrystals: Single Nanocrystal Photon Correlation Spectroscopy"]}]}],"canonical_facts":{"dc:contributor.advisor":["Bawendi, Moungi G."],"dc:contributor.department":["Massachusetts Institute of Technology. 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In the first chapter, I introduce the photophysical properties of colloidal NCs and spectroscopic techniques relevant to my studies. In the second chapter, I determine the dominant photoluminescent line shape broadening mechanisms in single InP/ZnSe/ZnS and CdSe/CdS/ZnS NCs using temperature dependent photoluminescent spectroscopic techniques. In the third chapter, I investigate the coherent emissive properties of single InP/ZnSe/ZnS and CdSe/CdS/ZnS at cryogenic temperatures, demonstrating the longest coherence time measured in a colloidal NC system to date. In the fourth chapter, I develop an ensemble third-order correlation technique to elucidate the average single ZnSe/ZnS NC triexciton efficiency and dynamics. Finally, I propose future directions in the fifth chapter, including a fourth order correlation technique to resolve absolute energy information on timescales faster than CCDbase spectroscopic techniques, and an open-access photon correlation Monte Carlo toolkit with the aim of filling education gaps and provide the colloidal NC community with a database of analytical tools that will encourage a wider audience to engage with photon correlation spectroscopy."],"dc:description.degree":["Ph.D."],"dc:identifier.uri":["https://hdl.handle.net/1721.1/157111"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["In Copyright - Educational Use Permitted","Copyright retained by author(s)"],"dc:rights.uri":["https://rightsstatements.org/page/InC-EDU/1.0/"],"dc:title":["Optical Properties of Colloidal II-VI and III-V Semiconductor Nanocrystals: Single Nanocrystal Photon Correlation Spectroscopy"],"dc:type":["Thesis"],"thesis:degree_name":["Doctoral","Doctor of Philosophy"]},"updated_at":"2026-07-22T22:21:52Z"}