dc.contributor.advisor | Demir, Hilmi Volkan | |
dc.contributor.author | Ahmad, Muhammad | |
dc.date.accessioned | 2023-03-01T13:09:35Z | |
dc.date.available | 2023-03-01T13:09:35Z | |
dc.date.copyright | 2022-12 | |
dc.date.issued | 2022-12 | |
dc.date.submitted | 2023-01-16 | |
dc.identifier.uri | http://hdl.handle.net/11693/112003 | |
dc.description | Cataloged from PDF version of article. | en_US |
dc.description | Thesis (Master's): Bilkent University, Graduate Program in Materials Science and Nanotechnology, İhsan Doğramacı Bilkent University, 2022. | en_US |
dc.description | Includes bibliographical references (leaves 48-52). | en_US |
dc.description.abstract | Semiconductor nanoplatelets (NPLs) make an interesting group of nanocrystals with unique
optical properties as a result of their quasi 2-dimensional (2D) electronic structure. Such
emerging fascinating optical features of NPLs include high absorption cross-section, narrow
emission linewidths, and reduced Auger recombination, making them a superior choice
compared to conventional semiconductor nanocrystals for optoelectronic applications. Doping
of these materials with transition metals, such as silver and copper, provides great
opportunities to modify and tune the electronic structure of these NPLs for various devices
including light-emitting diodes and luminescent solar concentrators. Such doping with
transition metals allows for manipulation of the photoluminescence from these NPLs, control
of the recombination processes of the photogenerated carriers in these NPLs, and observation
of the giant Zeeman effect as a result of exchange interactions between the dopants and carriers
in these NPLs. Previously, CdSe NPLs have been doped with copper and silver only up to
vertical thickness of 5 monolayers (ML). However, doping of thicker NPLs has not been
possible to date. In this thesis work, we successfully doped thick CdSe NPLs having 7 ML in
thickness with silver and copper using partial cation exchange to obtain large Stokes-shifted
emission in the near-infrared (NIR) region. Here, the effect of precursor ratio and reaction
temperature were systematically studied to tune the resulting emission. For both copper and
silver dopants, we successfully quenched fully the band-edge emission, and purely dopantinduced
emission was obtained. We also co-doped these NPLs with silver and copper, and we
successfully obtained both copper- and silver-induced emissions from these NPLs. We further
grew the CdZnS shell on 7 ML CdSe core by hot injection method and doped the resulting CdSe/CdZnS core/shell NPLs with silver and copper to push their emission further towards longer wavelengths in the NIR region. These thick doped-NPLs with large Stokes shift and emission in the NIR region present a promising platform for light-emitting and -harvesting
applications. | en_US |
dc.description.statementofresponsibility | by Muhammad Ahmad | en_US |
dc.format.extent | xiii, 52 leaves : charts ; 30 cm. | en_US |
dc.language.iso | English | en_US |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | Colloidal nanoplatelets | en_US |
dc.subject | Doping, Stokes-shifted emission | en_US |
dc.subject | Partial cation exchange | en_US |
dc.subject | Thick nanoplatelets | en_US |
dc.title | Colloidal doping of thick nanoplatelets | en_US |
dc.title.alternative | Kalın nanolevhaların kolloidal katkılanması | en_US |
dc.type | Thesis | en_US |
dc.department | Institute of Materials Science and Nanotechnology (UNAM) | en_US |
dc.publisher | Bilkent University | en_US |
dc.description.degree | M.S. | en_US |
dc.identifier.itemid | B161689 | |