%0 Journal Article
%T Temperature Dependent Mechanical Analysis of Chalcogenide (CdS, ZnS) Coated PET Films
%A Sandhya Gupta
%A Kananbala Sharma
%A N. S. Saxena
%J ISRN Polymer Science
%D 2013
%R 10.1155/2013/952612
%X Commercial polyethylene terephthalate (PET) film has been used as flexible substrate, and chalcogenide materials such as CdS, ZnS have been coated separately on PET film using vacuum thermal evaporation method. The structural characterisation of CdS-PET and ZnS-PET films has been performed by X-ray diffraction (XRD) pattern and Fourier transforms infrared (FTIR) spectroscopy. The surface morphology of CdS-PET and ZnS-PET films has also been investigated using scanning electron microscope (SEM). Temperature dependent mechanical study of chalcogenide-PET films has been carried out using Dynamic Mechanical Analyser (DMA). The stress-strain curves of chalcogenide coated PET films at room and elevated temperatures explain the mechanical response of these films under the different temperature. 1. Introduction Metal chalcogenides (sulfides, tellurides, and selenides) are of great importance for researchers because they are potential candidates for optoelectronic applications such as photodetectors, solar cells, and thin film transistor [1¨C6]. CdS thin films are regarded as one of the most promising materials for heterojunction thin film solar cells. Wide band CdS has been used as the window material together with several semiconductors such as CdTe, Cu2S, InP, and CuInSe2 with 14¨C16% efficiency [7, 8]. ZnS thin film has also potential applications in optoelectronic devices such as blue light emitting diodes [9], electroluminescence devices, and photovoltaic cells which enable wide application in the field of displays [10, 11], sensors, and lasers [12]. As the metallized polymer films are used in flexible optoelectronic devices, it is proved by Gupta et al. [13] that most of the metals show excellent adhesion with PET film with the help of stress-strain curves of metalized polymer film for a wide range of temperatures; therefore in the same way an effort has been made to see the effect of wide range of temperatures on chalcogenide (CdS, ZnS) coated polymer film. The change in mechanical stability, stiffness, and elasticity of chalcogenide coated polymer films with temperature is also important issue of study for the application point of view. The mechanical studies of CdS and ZnS coated polymer systems at elevated temperatures are very important for the development of light weight optoelectronic devices. In the present work polyethylene terephthalate (PET) film is used as flexible substrate because of its high mechanical strength. Many techniques have been reported for the deposition of CdS and ZnS thin films. These include evaporation, sputtering, chemical
%U http://www.hindawi.com/journals/isrn.polymer.science/2013/952612/