Electrical, Optical and Structural Properties of CdSe Nanocrystals coupled to Organic π-systems

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dc.contributor.advisor Scheele, Marcus (Prof. Dr.)
dc.contributor.author Kumar, Krishan
dc.date.accessioned 2021-01-28T08:59:35Z
dc.date.available 2021-01-28T08:59:35Z
dc.date.issued 2021-01-28
dc.identifier.other 1745927654 de_DE
dc.identifier.uri http://hdl.handle.net/10900/112217
dc.identifier.uri http://nbn-resolving.de/urn:nbn:de:bsz:21-dspace-1122178 de_DE
dc.identifier.uri http://dx.doi.org/10.15496/publikation-53593
dc.description.abstract This work focuses on the synthesis and optoelectronic properties of coupled organic-inorganic nanocrystal thin films. The hybrid materials studied herein are composed of CdSe nanocrystals (NCs) coupled with an organic semiconductor (OSC) material. The CdSe NCs were synthesized using a hot injection method, which requires encapsulation of the NCs with insulating organic ligands. These were removed with inorganic ligand (I-) to facilitate the electronic coupling and further incorporate OSCs. The work presented is divided into three parts. The first part talks about the ligand exchange of CdSe NCs with zinc β-tetraaminophthalocyanine linker molecule. The addition of dye molecules increases the optical on-off modulation of the device by 4.5 orders of magnitude in the near-infrared region where CdSe itself has very little absorption. The dye linker also introduces a fast rise time of 74 ± 11 ns upon optical gating with a near-infrared optical pulse. The second topic focuses on the effect of coupling aryleneethylene linker molecules with CdSe NCs. The coupling of linker molecules induces the aggregation-induced emission band of lower energy than the band-edge emission of CdSe NCs. Both the fluorescence band of the coupled system showed randomly induced anticorrelated fluorescence intensity variations. These variations become periodic upon cooling down the sample to ~160 K and the time period of the oscillations showed a strong dependence on laser power intensity. In addition, the coupled system also showed 3 orders of mobilities variation by cooling down the sample to cryogenic temperatures. The third part of the work focuses on the self-assembly of wurtzite and zinc-blende CdSe nanocrystalline systems. NMR spectroscopy was used to quantify the bound and free ligand densities. Small-angle and grazing incidence small-angle X-ray scattering techniques were used to reveal a ~10% increase in the lattice parameters of the self-assembled structure of CdSe NCs by varying the ligand density of nanocrystals. en
dc.language.iso en de_DE
dc.publisher Universität Tübingen de_DE
dc.rights ubt-podno de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_ohne_pod.php?la=de de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_ohne_pod.php?la=en en
dc.subject.classification Quantenpunkt , Halbleiter , Transistor , Fluoreszenz , Photonik de_DE
dc.subject.ddc 500 de_DE
dc.subject.ddc 540 de_DE
dc.subject.other Aggregation Induced Emission en
dc.subject.other Energy Transfer en
dc.subject.other Quantum dot en
dc.subject.other semiconductor en
dc.subject.other structure en
dc.subject.other fluorescence en
dc.subject.other Photonics en
dc.title Electrical, Optical and Structural Properties of CdSe Nanocrystals coupled to Organic π-systems en
dc.type PhDThesis de_DE
dcterms.dateAccepted 2021-01-15
utue.publikation.fachbereich Chemie de_DE
utue.publikation.fakultaet 7 Mathematisch-Naturwissenschaftliche Fakultät de_DE


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