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Abstract: (CdS) thin films have been prepared using chemical spray pyrolysis

technique. These films were exposed to different doses of y-rays in order to study the effect of y-radiation on the film structure and the direct transitions. X-ray diffraction technique shov.:ed that the prepared films before and after irradiation are polycrystalline showing hexagonal structure. The irradiation affrect CdS thin films to changing its color from the transparent yellow to dark rough yellow and decrease the value of energy gap as the irradiation increase.

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. (2 .4 2) e V t:?Jl,_,_...;:.

·~~¥' ~~ •.ll:.J J' (5'~ ~~ u! [3]

J ' wl.i.!JI ~\'1 · .1~1 ..u..:;.. < ~i · J -- '' .1' •.•. ~.~11 · 1 [4] . ..r--:- (.)A f"...t::-' - -~ - u.: ~ I,J" t:? ~ c::-- f..!·

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REFERENCES 1- W.J. Danaher, L.E. Lyons & G.C. Morris, "Solar Energy Mater.··

12,137-148,(1985). 2- Shailaija Kolhe, S.K. Kulkarni, M.G. T:1..lcwale & V.G. Bhide, "Solar

Energy Mater." 13,(1986).

3- P.K .. Nayr & M.T.S. Nair, " Solar Cells", 22, 103-112, No.2,

October (1987). 4- Shai1aija Kolhe, S.K. Kulkarni, M.G. Ta..lc\.vale "Solar Energy Mater."

15, 189-208,( 1987).

. - ....

5- Y. Ramprak:ash, V. Subramanian,R. Krishna Kumar A.S.Lakshmanan & V.K. Venikatesan, " Journal of Power Sources", 24,329-340,( 1988).

6- F. El- Akkad & M. Abdel Naby, "Solar Energy Mater." 18, 151-158,(1989).

7- M. LO. Savio & );f.E. Oliveri," Applied Phys.", A.50, 17-21, (1990).

8- Wichen, Thomas; Krings, thomas; Wolf, conference: " Condensed

Matter.", V.185, No. 1-4, P. 297-307, Trieste, Italy, April (1993). 9- S.M. Sze, " Semiconductor Devices.". 10- J.I.B. Wilson & J. Woods, "J.Phys. Solids'', 34,P. 171,(1973). 11- O.P. Agnihotri, M.T. Mohamd, A.K. Abass & K.L. Arshak. "Solid

State Comrn.", 47,195, (1983).

12- N.F. Habubi, M.M. Radi, W.Z. Manookian, "J. Of Math. & Phys'' . .• .

Vol.1,No.2 (1986). 13- B.A. Kuskos, A E. Ibrahim, N.F. Habubi, "J. Of College of

Education", No.2 (1995).

14- K.A. Mishjal, A E. Ibrahim, N.F. Habubi, "J. Of College of Education", No.2 (1995).

15- O.S. Heavens, " Thin Film Phys.", Halasted Press, A division of John Wiely & Sons Inc. New York, (1973).

16: R.J. Elliott & A,F. gibson, "An Introduction to Solid State Physics & irs Applications", Ylacrnillan, (1974).

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