![]() ![]() As ZnS shell has higher band gap compared to ZnSe core. In this study, we have chosen ZnSe/ZnS quantum dot because these CSQDs are considered novel nano-hetero-structures. Effect of ZnS shell formation on the confined energy levels of ZnSe quantum dots. A Theoretical Study on the Electronic Structure of ZnSe/ZnS and ZnS/ZnSe Core/Shell Nanoparticles. ![]() Some of the examples of CSQDs include ZnSe/ZnSe, ZnS/CdS, CdSe/HgS etc 7 7 Goswami B, Pal S, Sarkar P. The confined electrons/holes in CSQDs bear a strong barrier potential because of columbic interaction and extra deposited layer.In small QDs, the electrons/ holes confinement increases over the coulombic interaction due to which electrons/holes starts tunneling from core to shell takes place and the core structure exhibits a red shift in the absorption spectra 7 7 Goswami B, Pal S, Sarkar P. The deposited layer is referred to as shell and the quantum dot as a whole is referred to as CSQDs. The superficial bonds on the surfaces of quantum dots can be coated with suitable organic materials or inorganic materials and the materials used for coating must possess desired band gap and lattice matching so as to give the quantum dot (QD) a structural continuity. The Effects of Quantum Confinement and Magnetic Fields on the Binding Energy of Hydrogenic Impurities in low-Dimensional Systems. , 6 6 Vivas-Moreno JJ, Porras-Montenegro N. Quantum dots: Paradigm changes in semiconductor physics. These structures exhibit opto-electronic properties due to the quantum mechanical nature of the electrons 5 5 Bimberg D. Highly luminescent (ZnSe)ZnS core-shell quantum dots for blue to UV emission: synthesis and characterization. Advanced Nanomaterials and Nanotechnology. Synthesis of core-Shell Quantum Dots and their Potential Application. Synthesis and characterization of CdSe/ZnS core-shell quantum dots immobilized on solid substrates through laser irradiation. and core-shell quantum dot (CSQD) structures whose characteristic dimensions are comparable with the exciton Bohr radius 2 2 György E, Pérez del Pino A, Roqueta J, Ballesteros B, Miguel AS, Maycock C et al. Dependence of the Carrier Life Time on the Level Spacing in Semiconductor Quantum Dots. Recent advanced nanofabrication technology have made it possible to prepare three dimensionally confined quantum dot (QD) 1 1 Jang YD, Lee H, Lee D, Hong SU, Oh DK. Moreover, it is also found that for higher values of electron/hole energies (greater than 0.7eV), the transmission probability oscillates, which too has practical significance for quantum oscillators.The study is important from both basic and applied point of view.Ĭore shell Quantum dot Quantum tunneling Transmission probability Effective mass approximation Quantum oscillators ![]() We observed that quantum dot of small size core show superb characteristics of possible transmissions and the transmission probability of the carriers across the potential barrier can be controlled by varying the shell thickness, which has practical significance for electron transport in quantum dots, electron transfer in bio-sensors and chemo-sensors etc. In the first attempt, we introduced extra deposit shell thickness of ZnS in the range 0-5nm and calculated its size effects on the transmission of carriers from core to the shell. The transmission probabilities of electrons/holes were calculated within the frame work of effective mass approximation and quantum mechanical tunneling. In this paper we report the effect of shell thickness on transmission probabilities of electrons and holes in the strained configuration of zinc-selenide/zinc-sulphide (ZnSe/ZnS) core-shell quantum dot. ![]()
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