Electron localization in CdS nanocrystals studied by time-resolved terahertz spectroscopy
Measurement and Monte-Carlo simulations of THz photoconductivity spectra of CdS nanocrystalline films revealed a strong coupling between adjacent nanocrystals. Investigation of ultrafast dynamics provides information about initial sub-picosecond carrier cooling and subsequent carrier recombination.
Charge transport and localization in nanocrystalline CdS films: A time-resolved terahertz spectroscopy study
Z. Mics,1 H. Němec,1 I. Rychetský,1 P. Kužel,1,* P. Formánek,2 P. Malý,3 and P. Němec3 1Institute of Physics, Academy of Sciences of the Czech Republic, Prague, CZ-182 21, Czech Republic 2Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden, Germany 3Faculty of Mathematics and Physics, Charles University in Prague, Prague, CZ-121 16, Czech Republic (Received 11 March 2011; published 28 April 2011)
Developing an understanding of the processes controlling the chemical bath deposition of ZnS and CdS
The deposition of cadmium sulfide by chemical bath methods is straightforward and involves an alkaline solution of a cadmium salt, a complexant and a chalcogen source, often thiourea or thioacetamide. Supersaturation of the bath with respect to ‘Cd(OH) 
 2 
’ is necessary for the deposition of good quality films under a wide range of conditions. In contrast zinc sulfide is more difficult to deposit. In this paper we discuss the literature concerning the deposition of these chalcogenides and use equilibrium models to rationalise many of the observations found in the literature. Strategies for the deposition of high quality films of ZnS by CBD are discussed.