Electrical and optical properties of CdS nanocrystalline semiconductors

Abstract

II-VI semiconductor nanoparticles have recently attracted a lot of attention due to the possibility of their application in various devices. In the present study, chemical method has been used in synthesis of CdS nanoparticles and thiophenol was used as capping agent. X-ray diffraction studies of both samples were done. The dc conductivity of CdS increases at a lower rate or is approximately constant upto 500K and thereafter the conductivity increases at a rapid rate. Beyond T c it is seen that the portion of the σ dc versus 1000/T is almost a straight line showing an Arrehenious behaviour. The dielectric constant of nanoparticles of CdS is found to be larger than the corresponding values of CdS crystals. It is clearly observed that at lower wavelengths nanocrystalline samples show a blue-shift. The three peaks of sample (S2), A, Band C can be ascribed to the transition from Cd-O complex donor formed by adsorbed oxygen to the valance band, Cdexcess acceptor and the surface states, respectively.

Laser assisted solid state reaction for the synthesis of ZnS and CdS nanoparticles from metal xanthate

“…Zinc sulphide and cadmium sulphide are among the widely studied II -VI group semiconductors because they show significant quantum confinement effects which influence their electrical and optical properties [1,2]. They have found applications particularly in photovoltaic, photonic, and optoelectronic devices and sensors [3].…”

Formation of Hybrid Inorganic/Organic Nanocomposites

“…The particle size is smaller than the quantum size effect and is smaller than the Bohr exciton diameter of 5 nm for CdS. 30 No peak associated with free sulfur ion was observed in the Raman spectra. 31 It is therefore thought that, when the CdPc film was exposed to H 2 S, the demetallation of the central Cd ion occurred in accordance with the following possible reaction:…”

Dielectric properties of CdS nanoparticles synthesized by soft chemical route

“…During recent years, various properties of CdS have been investigated by researchers [4][5][6][7][8]. Though various researchers have studied the dielectric properties of CdS, a complete systematic study of various dielectric parameters in a wide frequency and temperature range is still lacking.…”