OPTICAL PROPERTIES OF MULTILAYER STRUCTURES ON THE BASIS OF SOLID SOLUTIONS OF THE SYSTEM CdS–ZnS, OBTAINED BY THE METHOD OF PYROLYSIS OF AEROSOL
DOI:
https://doi.org/10.17308/kcmf.2017.19/211Keywords:
multilayer semiconductor structures, solid solutions of CdS-ZnS, photoluminescence, photoconductivityAbstract
Multilayer film structures based on solid solutions of the CdS-ZnS system with variable thickness- concentrations of cadmium and zinc were obtained by the pyrolysis of aerosol solutions of thiocarbamide coordination compounds. Their transmission spectra, the photoluminescence spectra, and the temperature dependence of the photocurrent are studied. It is shown that the photocurrent at the wavelength of the exciting light (380 nm) is not monotonically dependent on the temperature, which is associated with the competition of carrier excitation and recombination processes
The purpose of this work is to study the crystal structure and properties of multilayer structures synthesized by pyrolysis of aerosol on the basis of solid solutions of the CdS-ZnS system with successive changes in the ratios of the atomic fractions of cadmium and zinc ions
It is established that the highest photoluminescence intensity is observed for layers precipitated from TCS [M (N2H4CS) 2CI2]. For all the samples, the luminescence bands broadened.
The results of X-ray phase analysis showed that all the layers deposited in the multilayer structure have a wurtzite modification, are polycrystalline, and have a pronounced crystallization direction.
The multilayer structures synthesized from [M(N2H4CS)2Br2] have a steady-state current value comparable to the values for individual CdS synthesized under similar conditions.
Optical studies have shown that the transmission spectra do not reflect the intrinsic absorption edge for each deposited layer.
The value of the bandgap width for CdS → ZnS samples is slightly increased when compared with individual CdS. Multilayer ZnS → CdS samples synthesized from chloride coordination compounds have a greater optical width compared to samples from bromide TCS.
ACKNOWLEDGMENTS
The research results were obtained with equipment of Voronezh State University Centre for Collective Use of Scientific Equipment.
