Role of Substrate Temperatures on Structural, Optical, Wetting and Electrical Transport Properties of CdS Thin Films

P. D. More

Materials Research Laboratory, Department of Physics, Ahmednagar College, Ahmednagar, India.

DOI: 10.4236/jsemat.2013.31006                

Abstract

Cadmium sulphide thin films were deposited on the glass substrate via simple spray pyrolysis technique. The substrate temperatures (T_s) have been varied from 250℃ to 350℃ and concentration of precursor’s solution of cadmium chloride and thiourea was optimized. The X-ray patterns and morphological studies of CdS thin films indicated that films are crystalline in nature with hexagonal crystal structure. The grain size calculated and found to be 250.12 to 349.61 nm. The optical spectra exhibited high transmittance and band gap varied from 2.41 eV to 2.39 eV. The angle of contact measured and found to be hydrophilicity behaviour. The electrical conductivity and thermoelectric power have been measured with two probe method. It was found that CdS thin films were semiconducting in nature with n-type.

Keywords

CdS Thin Film; Spray Pyrolysis; Band Gap; Contact Angle

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Y. Ni, H. Liu, F. Wang, Y. Liang, J. Hong, X. Ma and Z. Xu, “PbS Crystal with Clover like Structure: Preparation, Characterization, Optical Properties and Influencing Factors,” Crystal Research and Technology, Vol. 39, No. 3, 2004, pp. 200-206.
[2]	K. M. Garadkar, A. A. Patil, P. V. Korake and P. P. Hankare, “Characterization of CdS Thin Films Synthesized by SILAR Method at Room Temperature,” Archives of Applied Science Research, Vol. 2, No. 5, 2010, pp. 429-437.
[3]	N. I. Achuko and C. C. Ugwuegbu, “Optical Properties of CdS Thin Films Obtained by Chemical Bath Deposition,” International Journal of Academic Research, Vol. 6, 2011, pp. 368-374.
[4]	J. Barman, J. P. Borach and K. C. Sarma, “Effect of pH Variation on Size and Structure of CdS Nanocrystalline Thin Films,” Chalcoginide Letters, Vol. 11, No. 5, 2008, pp. 265-266.
[5]	K. K. Singh, M. Kar and H. L. Das, “Effect of Substrate Temperature on Photoconductivity in CdS Thin Films,” Indian .Journal of Pure & Applied Physics, Vol. 48, No. 2, 2010 pp.110-114.
[6]	S.-G. Hur and E.-T. Kim, J.-H. Lee, G.-H. Kim and S.-G. Yoon, “Characterization of Photoconductive CdS Thin Films Prepared on Glass Substrates for Photoconductive Sensor Applications,” Journal of Vacuum Science & Technology B, Vol. 26, No. 4, 2008, pp.1334-1337. doi:10.1116/1.2945301
[7]	A. Ashour, “Physical Properties of Spray Pyrolysed CdS Thin Films,” Turkish Journal of Physics, Vol. 27, No. 6, 2003, pp. 551-558.
[8]	C. S. Tepantlan, “Structural, Optical and Electrical Properties of CdS Thin Films by Spray Pyrolysis,” Revista Mexcana de Fisica, Vol. 54, No. 2, 2008, pp. 112-117.
[9]	J. Barman, K. C. Sarma, M. Sarma and K. Sarma, “Structural and Optical Studies of Chemically Prepared CdS Nanocrystalline Thin Films,” Indian Journal of Pure and Applied Physics, Vol. 46, 2008, pp.339-343.
[10]	D. Todorvsky, R. Todorvsky, N. Petrova, M. U._Bojnova and M. Milanova, “Spray-Pyrolysis, Deep- and Spin-Coating Deposition of Thin Films and Their Characteristics,” Journal of the University of Chemical Technology and Metallurgy, Vol. 41, No. 1, 2006, pp. 93-96.
[11]	JCPD Card No. 75-1545.
[12]	Y. Akaltun, M. A. Yildir?m, A. Ates and M. Yildirim, “The Relationship between Refractive Index-Energy Gap and the Film Thickness Effect on the Characteristic Parameters of CdSe Thin Films,” Optics Communications, Vol. 284, 2011, pp. 2307-2311.
[13]	P. D. More, G. S. Shahane, L. P. Deshmukh and P. N. Bhosale, “Spectro-Structural Characterisation of Cd (Se, Te) Alloyed Thin Film,” Materials Chemistry and Physics, Vol. 80, 2003, pp. 48-51.
[14]	D. P. Dubal, D. S. Dhawale, R. R. Salunkhe, S. M. Pawar, V. J. Fulari and C. D. Lokhande, “A Novel Chemical Synthesis of Interlocked Cubes of Hausmannite Mn3O4 Thin Films for Supercapacitor Application,” Journals of Alloys and Compounds, Vol. 848, 2009, pp. 218-221.
[15]	P. D. More and L. P. Deshmukh, “Electrical Conduction in Chemically Deposited CdSe1-xTex Mixed/Alloyed Thin Films,” Indian Journal of Engineering and Materials Sciences, Vol. 10, 2003, pp. 427-432.
[16]	S. L. Patil, M. A. Chougule, S. G. Pawar, B. T. Raut, S. Sen and V. B. Patil, “New Process for Synthesis of ZnO Thin Films: Microstructural, Optical and Electrical Characterization,” Journal of Alloys and Compounds, Vol. 509, No. 41, 2011, pp. 10055-10061.