Morphological and Optical Properties of CdS Nano-Crystalline Thin Films by Chemical Bath Deposition

Abstract:

CdS thin films were prepared by chemical bath deposition (CBD) at different ammonia concentration and different temperature using cadmium chloride hydrate, thiourea, ammonium chloride, ammonia and deionized water as precursors. The morphology structure and the optical properties of CdS thin films were characterized by scanning electron microscope (SEM), ultraviolet-visible spectra and spectroscopic ellipsometry. The results indicated that CdS thin film could be grown when ammonia concentration at the range of 0.4-1.0 mol /L and in the temperature range of 50 °C -80 °C. Within 600-980 nm wavelength，the average value of the refractive index was found to be 1.70 and the extinction coefficient was less than 0.08.

• Periodical: Key Engineering Materials (Volume 537)
• Pages: 144-149
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.537.144
• Online since: January 2013
• Authors: Yi Liu, Ai Xiang Wei, Xiao Dong Lin
• Keywords: CdS Thin Film, Chemical Bath Deposition (CBD), Optical Constant, Spectroscopic Ellipsometry

References

[1] V.R. Shinde, S.B. Mahadik, T.P. Gujar, Supercapacitive cobalt oxide (Co3O4) thin films by spray pyrolysis , Appl. Surf. Sci. 252(20) (2006) 7487-7492

DOI: 10.1016/j.apsusc.2005.09.004

[2] F. Gu, C. Li, Y. Hu, L. Zhang, Synthesis and optical characterization of Co3O4 nanocrystals, J. Cryst. Growth. 304 (2007) 369-373.

DOI: 10.1016/j.jcrysgro.2007.03.040

[3] M. Verelst, T. O. Ely, C. Amiens, Synthesis and characterization of CoO, Co3O4, and mixed Co/CoO nanoparticules, Chem. Mater. 11(10)(1999) 2702-2708.

DOI: 10.1021/cm991003h

[4] M.M. Natile, A. Glisenti, Surface reactivity of NiO: interaction with methanol, Chem. Mater. 14 (2002) 4895-4903.

DOI: 10.1021/cm0211047

[5] J. Britt, C. Ferekides, Thin film CdS/CdTe solar cell with 15.8% efficiency, Appl. Phys. Lett. 62 (22) (1993) 2851-2852.

DOI: 10.1063/1.109629

[6] K. Chidambaram, L. K. Malhotra, K. L. Chopra, Spray-pyrolysed cobalt black as a high temperature selective absorber, Thin Solid Films. 87 (1982) 365-371.

DOI: 10.1016/0040-6090(82)90289-9

[7] B. S. Moon, J. H. Lee, H. Jung, Comparative studies of the properties of CdS films deposited on different substrates by R.F. sputtering , Thin Solid Films. 511-512 ( 2006) 299-303.

DOI: 10.1016/j.tsf.2005.11.080

[8] E. W. Jones, V. Barrioz, S. J. C. Irvine, Towards ultra-thin CdTe solar cells using MOCVD, Thin Solid Films. 517( 7) ( 2009)2226-2230.

DOI: 10.1016/j.tsf.2008.10.093

[9] P. Boieriu, R.Sporken, A. Adriaens, SIMS and XPS characterization of CdS/CdTe hetero-structures grown by MBE, Nucl. Instrum. Methods Phys. Res. Sect. B. 161-163 (2000) 975-979.

DOI: 10.1016/s0168-583x(99)00926-x

[10] C. Nethravathi, S. Sen, N. Ravishankar, Ferrimagnetic nanogranular Co3O4 through solvo-thermal decomposition of colloidally dispersed monolayers of α-cobalt hydroxide, J. Phys. Chem. B. 109 (23) (2005) 11468-11472.

DOI: 10.1021/jp050725v

[11] A. Cortes, H.Gómez, R. E. Marotti, Grain size dependence of the bandgap in chemical bath deposited CdS thin films, Sol. Energy Mater. Sol. Cells. 82(1-2) (2004)21-34.

DOI: 10.1016/j.solmat.2004.01.002

[12] M. Froment, M. C. Bernard, R. Corles, Study of CdS epitaxial films chemically deposited from aqueous solutions on InP single crystals, J. Electrochem. Soc. 142(8) (1995)2642-2649.

DOI: 10.1149/1.2050067

[13] Q. Q. Liu, J. H. Shi, Z. Q. Li, Morphological and stoichiometric study of chemical bath deposited CdS films by varying ammonia concentration, Physica B. 405(2010)4360–4365

DOI: 10.1016/j.physb.2010.07.043

[14] M. A. Martínez, C. Guillén, J. Herrero, Morphological and structural studies of CBD-CdS thin films by microscopy and diffraction techniques, Appl. Surf. Sci. 136(1998)8-16.

DOI: 10.1016/s0169-4332(98)00331-6

[15] W. Li, X. Cai, Q. Chen, Z. Zhou, Influence of growth process on the structural, optical and Electrical properties of CBD-CdS films, Mater. Lett. 59 (2005) 1-5

[16] M. Kostoglou, N. Andritsos, A.J. Karabelas, Progress towards modelling the CdS chemical bath deposition process, Thin Solid Films. 387(2001) 115-117.

DOI: 10.1016/s0040-6090(00)01845-9

[17] G. E. Jellison, F. A. Modine, Parameterization of the optical functions of amorphous materials in the interband region, Appl. Phys. Lett. 69 (1996) 371-373.

DOI: 10.1063/1.118064

[18] G. E. Jellison, V. I. Merkulov, A. A. Puretzky, Characterization of thin-film amorphous semi-conductors using spectroscopic ellipsometry, Thin Solid Films, 377-378(2000) 68-73.

DOI: 10.1016/s0040-6090(00)01384-5

[19] O. Vogil, Y. Rodrìguez, O. Zelaya-Angel, Properties of CdS thin films chemically deposited in the presence of a magnetic field. Thin Solid Films 322 (1998) 329-333.

DOI: 10.1016/s0040-6090(97)00935-8