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Title: Synthesis and Optoelectronic Applications of Branched Semiconductor Nanocrystals
Keywords: Semiconductor Nanocrystals, Branched structures, shape control, metal deposition, optoelectronic device
Issue Date: 8-Jan-2013
Source: NIMAI MISHRA (2013-01-08). Synthesis and Optoelectronic Applications of Branched Semiconductor Nanocrystals. ScholarBank@NUS Repository.
Abstract: Shape control in both single- and multi-component semiconductor nanocrystal systems, which greatly impacts their physical and chemical properties, however, remains empirical and challenging. In this thesis we will elaborate on a systematic, surfactant-driven hot injection method to synthesize CdSe seeded CdS nanoheterostructures with very high yield. This was extended to other systems such as CdSe/CdTe and CdTe/CdS or PbSe/PbS and Ag2Se/Ag2S via cation exchange techniques. In order to elucidate the reactivity of the facets at the tips of such branched structures as a function of the shape of the arms, we exposed the structures of various arm dimensions to controlled amounts of metal precursors and discovered conditions in which the metal nanoparticle can be deposited precisely at the tip of one of four arms with symmetric reactivity. Finally, the thesis will showcase the utility of such branched heterostructures in applications such as photodetectors and solar cells.
Appears in Collections:Ph.D Theses (Open)

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