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Fabrication and characterization of quantum-confined optoelectronic devices based on CdSe nanocrystals

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dc.contributor.advisor Moungi G. Bawendi. en_US
dc.contributor.author Woo, Wing-Keung, 1972- en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Chemistry. en_US
dc.date.accessioned 2005-08-24T20:59:25Z
dc.date.available 2005-08-24T20:59:25Z
dc.date.copyright 2002 en_US
dc.date.issued 2002 en_US
dc.identifier.uri http://hdl.handle.net/1721.1/8176
dc.description Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2002. en_US
dc.description Includes bibliographical references. en_US
dc.description.abstract Colloidal semiconductor quantum dots (QDs), or nanocrystals (NCs), are the subject of intense research for their novel size dependent optical and electronic properties. Since the development of synthetic methods to produce cadmium selenide (CdSe) QDs with very controlled size-distributions and high crystalline quality, their potential applications in a variety of fields are being extensively explored. In this thesis, I present a simple chemical approach to greatly enhance not only the quantum yields of the CdSe and (CdSe)ZnS NCs, but also their viability in commercial applications such as LEDs, optoelectronics and biological tagging. Then I will describe our recent success in fabricating a solid-state NC capacitor. We can inject charges into these NCs with this device structure and control their fluorescence and absorption behavior. A green emitting LED with the CdSe NCs as the emissive material and a semiconducting polymer as the hole transport material is studied next. This is the first working device from which green electroluminescence of CdSe NCs is observed. Finally, I will describe results on the first efficient hybrid molecular organics/NCs LED. This device is a double heterojunction structure with a single monolayer of NCs sandwiched between 2 different molecular organics. This new device structure exhibits the highest reported quantum efficiency of 0.4%. en_US
dc.description.statementofresponsibility by Wing-Keung Woo. en_US
dc.format.extent 101 p. en_US
dc.format.extent 6098523 bytes
dc.format.extent 6098279 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri http://dspace.mit.edu/handle/1721.1/7582
dc.subject Chemistry. en_US
dc.title Fabrication and characterization of quantum-confined optoelectronic devices based on CdSe nanocrystals en_US
dc.type Thesis en_US
dc.description.degree Ph.D. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Chemistry. en_US
dc.identifier.oclc 51954706 en_US


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