Abstract
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. For this purpose both nanostructures were synthesized using chemical bath deposition technique in thin film form. The structural properties were studied using X-ray diffraction technique with Rietveld refinement and transmission electron microscopy (TEM). The surface morphology of synthesized thin film was illustrated in the form 2D and 3D images using atomic force microscopy (AFM). The optical properties were explained using UV–Vis absorption spectroscopy and photo luminescence (PL) spectroscopy in in situ monitoring process. 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.
Similar content being viewed by others
References
Alivisatos, A.P.: Semiconductor clusters, nanocrystals, and quantum dots. Science 271, 933–937 (1996)
Coe, S., Woo, W.K., Bawendi, M., Bulovic, V.: Electroluminescence from single monolayers of nanocrystals in molecular organic devices. Nature 420, 800–803 (2002)
Cullity, B.D.: Elements of X-ray diffraction. In: Cohen, M. (ed.) Structure of Polycrystalline Aggregates, 2nd edn, pp. 284–287. Addison Wesley, Boston (1956)
Dickson, R.M.: Three-dimensional imaging of single molecules solvated in pores of poly (acrylamide) gels. Science 274, 966–969 (1996)
Empedocles, S., Bawendi, M.: Spectroscopy of single CdSe nanocrystallites. Acc. Chem. Res. 32, 389–396 (1999)
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. Phys. Rev. B. 54, 17628–17637 (1996)
Henglein, A.: Small-particle research: physicochemical properties of extremely small colloidal metal and semiconductor particles. Chem. Rev. 89, 1861–1873 (1989)
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. Advan. Funct. Mater. 13, 73–79 (2003)
Klimov, V.I.: Optical nonlinearities and ultrafast carrier dynamics in semiconductor nanocrystals. J. Phys. Chem. B. 104, 6112–6123 (2000)
Liangling, H., Zhao, Y.L., Ryu, K., Zhao, C., Gruner, G.: Light-induced charge transfer in pyrene/CdSe-SWNT hybrids. Adv. Mat. 20, 939–946 (2008)
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. Nanotechnology 15, 572–580 (2004)
Niemeyer, C.M.: Nanoparticles, proteins, and nucleic acids: biotechnology meets materials science. Angew. Chemie. Inter. Ed. 40, 4128–4158 (2001)
Niemeyer, C.M., Ceyhan, B., Hazarika, P.: Oligofunctional DNA–gold nanoparticle conjugates. Angew. Chemie. Inter. Ed. 42, 5766–5770 (2003)
Qi, D., Fischbein, M.D., Drndic, M., Selmic, S.: Efficient polymer-nanocrystal quantum-dot photodetectors. App. Phy. Let. 86, 093103 (2005)
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. J. Appl. Phys. 82, 5837–5842 (1997)
Sharma, M., Gupta, D., Kaushik, D., Sharma, A.B., Pandey, R.K.: Study of self-organized CdS Q-dots. J. Nanosci. Nanotech. 8, 4303–4308 (2008)
Suzuki, N., Yasuo, T., Kojima, T.: Holographic recording in TiO2 nanoparticle-dispersed methacrylate photopolymer films. Appl. Phys. Lett. 81, 4121–4123 (2002)
Weller, H., Bunsenges, B.: Quantum sized semiconductor particles in solution and in modified layers. Phys. Chem. 95, 1361–1365 (1991)
Xie, R.G., Kolb, U., Li, J.X., Basche, T., Mews, A.: Synthesis and characterization of highly luminescent CdSe-core CdS/Zn0.5Cd0.5S/ZnS multishell nanocrystals. J. Am. Chem. Soc. 127, 7480–7488 (2005)
Acknowledgements
The authors would like to thank UGC, DAE-CSR, Indore for TEM measurements.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mishra, N., Rathore, D. & Pandey, R.K. A comparative study of conventional type II and inverted core–shell nanostructures based on CdSe and ZnS. Opt Quant Electron 50, 107 (2018). https://doi.org/10.1007/s11082-018-1378-3
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s11082-018-1378-3