Effect of Annealing on the Activation Energy of Thin Films of Manganese Sulphide, Copper Phthalocyanine and Multilayer Manganese Sulphide-Copper Phthalocyanine from their Electrical Studies

摘要

Manganese Sulphide (MnS) thin films are prepared onto glass substrates by chemical bath deposition (CBD) technique. Thin films of Copper phthalocyanine (CuPc) are also sublimed onto glass substrates in high vacuum at room temperature. Multi layer MnS- CuPc thin films are obtained from MnS films grown on glass substrates by CBD technique and subsequently vacuum subliming CuPc onto them. These films are annealed in air at different temperatures. Electrical conductivity studies are made separately on MnS, CuPc and multi layer MnS-CuPc 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.