Determination of the Activation Energy of Chemically Prepared Thin Films of Lead Sulphide, Copper Sulphide and Multi Layer Lead Sulphide-Copper Sulphide

Mercy Iypea*, Shaji Vargheseb, E. J. Mathewc, and  C. S. Menond

¹Department of Chemistry, Marthoma College, Tiruvalla, Kerala- 689 103 (India) ²Deptartment of Physics, St. Thomas College, Kozhencherry, Kerala- 689 103 (India) ³Deptartment of Chemistry, S.B. College, Changanacherry, Kerala- 689 103 (India) ⁴School of Pure and Applied Physics, M.G. University, Kottayam, Kerala- 689 103 (India)

Lead sulphide (PbS) and Copper sulphide (CuS) thin films are deposited on glass substrates by chemical bath deposition technique (CBD). Multi layer PbS-CuS thin films are also obtained by chemical bath deposition technique (CBD) by using CuS films as substrates for the deposition of PbS films. Electrical conductivity studies are made separately on PbS, CuS and multi layer PbS-CuS thin films. Thermal activation energy of the as deposited and annealed samples are determined from the Arrhenius plot. It is found that the activation energy decreases with annealing temperature. This may be due to the reduction in trap sites during annealing.

Activation energy; thin films; lead-sulphide; copper sulphide