Structural and Optical Properties ofCdSxTe1-xThin Films Fabricated by Thermal Evaporation.

S. AL-Jumaili, Hamid; O.Abdolhadi, Omar

doi:10.37652/juaps.2013.85002

Document Type : Research Paper

Authors

University Of Anbar - College of Education for Pure Science

https://doi.org/10.37652/juaps.2013.85002

Abstract

CdSxTe1-x films in the range of ( x=0.9 , 0.8, 0.7 ) about 300 nm thickness have been formed on glass substrates by thermal evaporation . X-ray results showed that the CdTe film was polycrystalline with cubic zinc blend structure and had preferred growth of grains along the (111) crystallographic direction.Also, CdS was polycrystalline with hexagonal wurtzitestructure and had preferred growth of grains along (002) crystallographic direction while CdSxTe1-x films studied the phase change with an inversion point related to the x-value . Transmittance and absorbance spectra of the films were measured as a function of wavelength (300-1100)nm . Then the band gap of the films calculated by using absorption spectrum, where the direct optical energy gap for CdTe is 1.48 eV and for CdS is 2.5 eVwhile the direct optical gap ofCdSxTe1-x films be limited to between CdS and CdTe , and varied non-linearly , showing downward with decrease x-value.Also the refractive index (n) of these films are discussed.

Keywords

Main Subjects

Chemistry

References

[1]J.Han, C. Spanheimer, G. Handl, G. Fu, V. Krishnakumar, J. Schaffner, C. Fan, K. Zhoo, A.Klein, and W.Jaegermann."Optimized chemical bath deposited CdS layers for the improvement of CdTe solar cells" Solar Energy Materials, Solar Cells 95 (2011)pp. 816-810 .

[2] Xavier Mathew, Jose S. Cruz, David R. Coronado, Aduljay R.Millan, Gildardo C. Segura, Erik R. Morales, Omar S. Martinez, Christian C. Garcia, Eduardo P. Landa " CdS thin film post-annealing and Te-S interdiffusion in a CdTe/CdS solar cell" Solar Energy 86 (2012)pp.1023-1028. .

[3]R. Mendoza-Perez, J. Sastre-Hernandez, G. Contreras- Puente, O. Vigil-Galan" CdTe Solar Cell degradation studies with the use of CdS as the window material" Solar Cell Materials & Solar Cells 93 (2009)pp. 79-84 .

[4]Tom Markvart, Luis Castaner : Practical Handbook of Photovoltaics Fundamentals and Application, Vol.2,(2003) p. 333. .

[5]Byung Tae Ahn, Jae Ho Yun, Eun Seok, Gyuchan Park " Understanding the junction degradation mechanism in CdS/CdTe solar cells using a Cd-deficient CdTe layer Current" . . Applied Physics 12 (2012) pp.174- 178.

[6] Junfeng Han, Cheng Liao, Tao Jiang, . C.Spanheimer, G.Haindl, Ganhua Fu, V. Krishnaknakumar, Kuizhao, A. Klein, W. Jaegermann " An optimized multilayer .structure of CdS layer for CdTe solar cells application " Journal of Alloys and Compounds 509 (2011) pp.5285-5289 .

[7]Shadia J.Ikhmayies, Riyad N.Ahmad- Bitar "Interface photoluminescence of the SnO2:F/CdS: In/CdTe thin film solar cells prepared partially by the spray pyrolysis technique " Journal of Luminescence 132 (2012) pp.502-506 .

[8]T. Takamoto, T. Aguia, H. Kurita, .M. Ohmori " Improved junction formation . procdure for low temperature deposited CdS/CdTe solar cells" Solar Energy .materials and Solar Cells 49(1997) pp.219- 5

[9] R. Dhere, X. Wu, D. Albin, C. Perkins, H. Moutinho, and T.Gessert "Formation and Characterization of CdSxTe1-x Alloys Prepared from Thin Film Couples of CdS and CdTe "(2002) NREL/CP- 520-31435.

[10] K.R. Murali . P.Thirumoorthy . C.Kannan, V. Sengodan "Pulse plated CdSxTe1-x films and their properties" Solar Energy83 (2009) pp.14-20 .

[11] S.Ghemid . S. Oundadji, H.Mrablia, S. Labidi "(FP-LPAW) Investigation of Ternary Alloys : CdS1-xTex" Physics Procedia 2 (2009) pp.881-887.

[12] Jian Li, N. J. Podraza, and R.W. Collins "Real time spectroscopic ellipsometry of sputtered CdTe,CdS,and CdTe1-xSx thin films for photovoltaic applications" Phys.stat.sol. (a) 205, No.4 (2008) pp. 901-904.

[13] .J. Touskova, D. Kindl, L. Dobiasova, J. Tousek "Influence of growth and microstructure of chemical deposited CdS films on the electrical properties of CdS/CdTe solar cells" Solar Energy Materials and Solar Cells 53 (1997) pp.177-188.

[14]Emad Khdayer AL-Shakarchi "Computational Study for the Structural Change of the System CdTe1-xSx Thin film" Turk J Phys 25 (2001), .pp.355-362 .

[15] D. Saikia, P.K. Gogoi, P.K. Saikia "Structural and Optical Properties of Nanostructured .CdS Thin Films Deposited at Different .Preparative Conditions" Vol. 7, No. 5, May(2010) pp.331-333.

[16] Greenaway D.L. and Harbeke G. "Optical Properties and Band Structure of Semiconductors" Pergamon Press, Oxford (1970).

[17] D.A. Wood, D.W. Lane, K.D. Rogers, and J.A. Coath "Optical Properties of CdSxTe1-x Polycrystalline Thin Films " Journal of Electronc Materials, Vol.28,No.12, (1999) pp.1403-1408.

[18] M. Amlouk, M. Dachraout, S. Belgacem and R. Bennaceur "Structural, Optical and Electrical Properties of SnO2:F and CdS Airless Sprayed Layer" Vol. 105,(1983)pp.131-138 .

Journal of University of Anbar for Pure Science

Structural and Optical Properties ofCdSxTe1-xThin Films Fabricated by Thermal Evaporation.

References

References

Volume 7, Issue 2
August 2013
Page 1-3

Structural and Optical Properties ofCdSxTe1-xThin Films Fabricated by Thermal Evaporation.

References

References

Volume 7, Issue 2August 2013Page 1-3

Volume 7, Issue 2
August 2013
Page 1-3