Weller, H., Bunsenges, B.: Quantum sized semiconductor particles in solution and in modified layers. Suzuki, N., Yasuo, T., Kojima, T.: Holographic recording in TiO 2 nanoparticle-dispersed methacrylate photopolymer films. Sharma, M., Gupta, D., Kaushik, D., Sharma, A.B., Pandey, R.K.: Study of self-organized CdS Q-dots. Schlamp, M.C., Peng, X.G., Alivisatos, A.P.: Improved efficiencies in light emitting diodes made with CdSe(CdS) core/shell type nanocrystals and a semiconducting polymer. Qi, D., Fischbein, M.D., Drndic, M., Selmic, S.: Efficient polymer-nanocrystal quantum-dot photodetectors. Niemeyer, C.M., Ceyhan, B., Hazarika, P.: Oligofunctional DNA–gold nanoparticle conjugates. Niemeyer, C.M.: Nanoparticles, proteins, and nucleic acids: biotechnology meets materials science. Mazhar, J., Shrivastav, A.K., Nandedkar, R.V., Pandey, R.K.: Strained ZnSe nanostructure investigations by X-ray, AFM TEM and optical absorption lumnisance spectra. Liangling, H., Zhao, Y.L., Ryu, K., Zhao, C., Gruner, G.: Light-induced charge transfer in pyrene/CdSe-SWNT hybrids. Klimov, V.I.: Optical nonlinearities and ultrafast carrier dynamics in semiconductor nanocrystals. Huynh, W.U., Dittmer, J.J., Libby, W.C., Whiting, G.L., Alivisatos, A.P.: Controlling the morphology of nanocrystal–polymer composites for solar cells. Henglein, A.: Small-particle research: physicochemical properties of extremely small colloidal metal and semiconductor particles. Greenham, N.C., Peng, X.G., Alivisatos, A.P.: Charge separation and transport in conjugated-polymer/semiconductor-nanocrystal composites studied by photoluminescence quenching and photoconductivity. Science 274, 966–969 (1996)Įmpedocles, S., Bawendi, M.: Spectroscopy of single CdSe nanocrystallites. Addison Wesley, Boston (1956)ĭickson, R.M.: Three-dimensional imaging of single molecules solvated in pores of poly (acrylamide) gels. (2004) Inverted core/shell nanocrystals continuously tunable between type- I. (ed.) Structure of Polycrystalline Aggregates, 2nd edn, pp. 35 Balet, L.P., Ivanov, S.A., Piryatinski, A., Achermann, M. Science 271, 933–937 (1996)Ĭoe, S., Woo, W.K., Bawendi, M., Bulovic, V.: Electroluminescence from single monolayers of nanocrystals in molecular organic devices. A comparison of estimated particle size from XRD, high resolution AFM and TEM images was resulted in good agreement as 2.1, 2.4 and 2.1 nm respectively for conventional CdSe/ZnS core–shell and as 2.5, 2.5 and 2.2 nm respectively for inverted ZnS/CdSe core–shell nanostructures.Īlivisatos, A.P.: Semiconductor clusters, nanocrystals, and quantum dots. The optical properties were explained using UV–Vis absorption spectroscopy and photo luminescence (PL) spectroscopy in in situ monitoring process. The surface morphology of synthesized thin film was illustrated in the form 2D and 3D images using atomic force microscopy (AFM). The structural properties were studied using X-ray diffraction technique with Rietveld refinement and transmission electron microscopy (TEM). For this purpose both nanostructures were synthesized using chemical bath deposition technique in thin film form. We have also investigated the radius-dependent changes in binding energies and lifetimes of the structures and the comparative results have been discussed in a detail manner.The objective of this work is to investigate structural, morphological and optical properties of conventional CdSe/ZnS core–shell and inverted ZnS/CdSe core–shell nanostructures for opto-electronic device applications. The transition energy shifts of double and triple excitons with respect to the single exciton have been calculated as a function of the core radius and we have shown that the energy shifts are inversely proportional with the radius. We have observed that the core-radius dependent transition energy variations of triexcitons are higher when compared with single- and bi-excitonic systems. Absorption peaks or transition energies of the triexciton system are well separated from those of single- and bi-exciton systems. We have demonstrated that the optical properties of triexciton systems are remarkably different from the single and biexciton systems. In calculations, the exchange-correlation effects between identical particles have been taken into account in the frame of the local density approximation. The electronic structure has been determined by solving of the Poisson–Schrödinger equations self-consistently. In the study, we aim to investigate the electronic and optical properties of single excitons, biexcions and triexcitons in a CdSe/ZnS core/shell quantum dot nanocrystal.

Klimov inverted core shell