Structural dependent, dielectric and conduction analysis of CdSe based quantum dots

Abstract

Nowadays, the effect of temperature on nanocrystal's dielectric has become a routine study while their structural effects on dielectric properties, lacks the attention of researchers. The correlation of different shell arrangement on dielectric enhancement in CdSe based quantum dots, is addressed in this letter. Detrimental impact of surface defects on dielectric properties of quantum dots is investigated and shown that surface defects of bare core increases dielectric loss, dissipation factor and decreases conductivity of the quantum dots. Dielectric properties of quantum dots is evaluated after deposition of different shells and multishells. It is observed that loss factor is declined in core/shell(multishell) quantum dots due to passivation of surface defects and consequently ease in charge carrier tunneling. Higher conductivity of the core/shell and multishell structures has also been demonstrated here. Structural and optical investigation of the quantum dots after shell deposition is also considered.

Novel two-dimensional ZnO2, CdO2 and HgO2 monolayers: a first-principles-based prediction

“…Experimentally, there have been several synthesis methods have been developed for group-II chalcogenide compounds, including colloidal approach 38 , colloidal ALD 39 , chemical bath deposition 40 , CVD 41 . Their unique properties have been revealed by a lot of theoretical cal-culations and analytical methods [42][43][44][45][46][47] .…”

The Effect of Quantum Confinement on Optical Properties of CdSe Quantum Dots at Room Temperature

“…Fig. (6 a) acts the real part of the dielectric constant ε 1 since the dielectric constant determines the number of polarized atoms optically towards the internal electric field, it was observed that ε1 appears to be constant in this range of wavelengths That is the determination of the number of polarized atoms towards the internal electric field [35]. On the other hand, since the smallest quantum dots contain fewer atoms, that is, the atoms that are affected by the optical polarization will in any way be less.…”

Interfacial strain and shell thickness effect on core squeeze/stretch in core/shell quantum dots

“…The nanoscale semiconductor heterostructures amd for instance core/shell quantum dots (QDs) with diameters smaller than the bulk exciton Bohr radius are new class of materials intermediates between molecular and bulk solid forms. CdSe based core-shell type quantum dots (QDs) exhibit novel properties making them attractive from both experimental and theoretical point of view [5][6][7][8][9][10][11][12]. It has been shown that coating core semiconductor with larger band gap of its kind, improve properties of nanocrystals (NCs) [13,14].…”