Print Email Facebook Twitter Electronic coupling of colloidal CdSe nanocrystals monitored by thin-film positron-electron momentum density methods Title Electronic coupling of colloidal CdSe nanocrystals monitored by thin-film positron-electron momentum density methods Author Eijt, S.W.H. Mijnarends, P.E. Van Schaarenburg, L.C. Houtepen, A.J. Vanmaekelbergh, D. Barbiellini, B. Bansil, A. Faculty Applied Sciences Department Radiation, Radionuclides and Reactors Date 2009-03-06 Abstract The effect of temperature controlled annealing on the confined valence electron states in CdSe nanocrystal arrays, deposited as thin films, was studied using two-dimensional angular correlation of annihilation radiation. A reduction in the intensity by ?35% was observed in a feature of the positron annihilation spectrum upon removal of the pyridine capping molecules above 200?°C in a vacuum. This reduction is explained by an increased electronic interaction of the valence orbitals of neighboring nanocrystals, induced by the formation of inorganic interfaces. Partial evaporation of the nanoporous CdSe layer and additional sintering into a polycrystalline thin film were observed at a relatively low temperature of ?486?°C. Subject annealingcadmium compoundscolloidal crystalsenergy gapII-VI semiconductorsnanoporous materialsnanostructured materialspositron annihilationsemiconductor thin filmssinteringvacuum depositionwide band gap semiconductors To reference this document use: http://resolver.tudelft.nl/uuid:d3445888-3bb5-4873-8b41-6597573a34d5 DOI https://doi.org/10.1063/1.3094751 Publisher American Institute of Physics ISSN 0003-6951 Source http://link.aip.org/link/APPLAB/v94/i9/p091908/s1 Source Applied Physics Letters, 94 (9), 2009 Part of collection Institutional Repository Document type journal article Rights (c) 2009 The Author(s); American Institute of Physics Files PDF Eijt_2009.pdf 269.06 KB Close viewer /islandora/object/uuid:d3445888-3bb5-4873-8b41-6597573a34d5/datastream/OBJ/view