Wurtzite structures, such as ZnO, GaN, InN and CdS, are piezoelectric semiconductor materials. A piezopotential is formed in the crystal by the piezoelectric charges created by applying a stress. The inner-crystal piezopotential can effectively tune/control the carrier separations and transport processes at the vicinity of a p–n junction or metal–semiconductor contact, which is called the piezo...

in this report, we present a facile approach for the synthesis of luminescent cds and cds:mn+2 nanocrystals by reaction of cdso4 and na2s2o3 in the presence of thioglycerol (c3h8o2s) as capping agent. the influence of various experimental variables including, ph values and percentage of dopant, on the growth rate and optical properties of the obtained cds nanocrystals has been systematically in...

We extend the adiabatic bond charge model, originally developed for group IV semiconductors and III-V compounds, to study phonons in more ionic IIVI compounds with a zincblende structure. Phonon spectra, density of states and specific heats are calculated for six II-VI compounds and compared with both experimental data and the results of other models. We show that the 6parameter bond charge mod...

Carbon quantum dots (CDs) are a fascinating class of carbon nanomaterials (less than 10 nm in size) with unique optical, electrical, and physicochemical properties. In addition to these properties, CQDs exhibit the desired advantages aqueous stability, low toxicity, high surface area, economic feasibility, chemical inertness, highly tunable photoluminescence behaviour. Recently, graphitic nitri...

In order to realize solar cells with technologically useful performance, intensive efforts are being directed towards the development of novel device architectures and components. So far, high power conversion effi ciencies exceeding 5% have been reached with dye-sensitized [ 1 ] or polymer blend-based solar cells, [ 2 ] wherein very fast interfacial charge transfer occurs. However, charge tran...

CdSe/CdS nanocrystals (NCs) are among the most studied semiconductor nanocrystals, yet there is still much information to be gained. This work reveals that core@shell NCs with different shapes more controlled by interaction between NC surface and capping ligands than core concentration, but not at all difference in crystalline nature of core. Among precursors, cadmium carboxylates promote an is...

A three-dimensional (3D) mesoporous Fe2O3−CdS nanopyramid heterostructure is developed for solar-driven, realtime, and selective photoelectrochemical sensing of Cu in the living cells. Fabrication of the mesoporous Fe2O3 nanopyramids is realized by an interfacial aligned growth and self-assembly process, based on the van der drift model and subsequent selective in situ growth of CdS nanocrystal...