Optical properties of CdS nanoclusters: effects of size,stoichiometry and alloying with Ag2S |
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| Institution: | 1. LUT University, School of Energy Systems, P.O. Box 20, FI-53851 Lappeenranta, Finland;2. University of Stuttgart, Institute for Social Sciences, Department for Organisational Sociology and Innovation Studies, Stuttgart, Germany;1. VELMAN, Ltd., 43 Russkaya Str., 630090 Novosibirsk, Russia;2. Sobolev Institute of Geology and Mineralogy SB RAS, 3 Koptyug av., 630090 Novosibirsk, Russia;3. Novosibirsk State University, 2 Pirogova str., 630090 Novosibirsk, Russia;4. Kutateladze Institute of Thermophysics SB RAS, 1 Lavrentyev av., 630090 Novosibirsk, Russia;1. Laboratory of Clinical Microbiology, Mycology and Antibiotic Therapy, National Research Center for Hematology, Noviy Zykovskiy proezd 4A, Moscow, 125167, Russian Federation;2. Head of the Laboratory of Clinical Microbiology, Mycology and Antibiotic Therapy, National Research Center for Hematology Moscow, Russian Federation |
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| Abstract: | The optical absorption and photoluminescence (PL) properties of nanosize CdS clusters synthesized by chemical bath deposition technique using precursor chemicals of high purity CdCl2, thiourea and NH4Cl are presented. The crystallite sizes were controlled by the reaction rate, concentration of the reactants of the chemical bath and thickness of the film. Relative to bulk crystals, the band gap (Eg∼2.5 eV) of CdS clusters is significantly blue-shifted with decreasing cluster size. CdS nanoclusters present a mixed hexagonal/cubic structure, which indicates that CdS formation occurs primarily via “ion-to-ion” process. Scanning electron microscopic studies of CdS films revealed that the films are composed of domains, which are formed from the coalescence of smaller crystallites. The PL excitation band is interpreted as an excitation of CdS molecular levels in the interior of the cluster. Results on Ag2S alloying with the CdS nanoclusters show that surface related states of one material can be excited through states of a different interior material. |
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