Journal
JOURNAL OF NANOPHOTONICS
Volume 7, Issue -, Pages -Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.JNP.7.073075
Keywords
semiconductors; nanostructures; lead sulfide; opto-impedance spectroscopy; multiexciton generation
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Nanostructures of lead sulfide (E-g similar to 0.67 to 1.7 eV) corresponding to different quantum confinement regimes (weak, moderate, and strong with radii 14, 11, and 7 nm, respectively) have been synthesized through facile aqueous colloidal method and have been capped using poly vinyl alcohol. There is a marked difference in electron-lattice coupling properties as revealed through Fourier transform infrared data with strong quantum confined PbS quantum dots (QDs) exhibiting pronounced electron-lattice coupling characteristics. Opto-impedance characteristics of these samples suggest the enhanced mobility of charges, in particular under the supra gap excitation for strong quantum confined QDs. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
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