Thursday, 2 June 2022: 16:20
West Meeting Room 203 (Vancouver Convention Center)
Deposition of Flexible Transparent Conducting Sulfide (FTCS) thin film of CdS in PVA matrix, with doped Copper, using precursor solutions containing Cd2+ and S2− ions, is performed by chemical route using heat induced thermolysis technique on a PET substrate. This FTCS thin film assembly with PET substrate behaves as a non polarized capacitor and work as a voltage divider that does not require transformer and rectifier stages to operate an LED connected to it. The absorbance of the synthesized film is acquired in the range between 300 to 900 nm and the direct band gap is estimated using effective mass approximation method, yielding values between 2.54 to 2.80 eV. A highly intensified and broad XRD peak is observed at 2θ value of 26.20 which indicates the formation of very small sized nanocrystalline thin film of doped CdS. Scanning electron microscopic pictures were obtained to assess the morphology of the film surface. The sheet resistance for the film which is 60% transparent is measured as 200 Ω whereas the corresponding value for the film which is 80 % transparent is 700 Ω. Sheet resistance and transmittance of the doped CdS thin film was found to remain unchanged even when it was subjected to bending operation of 900 for 24 hours under ambient conditions.
Keywords: FTCS Thin Film Capacitor, Thermolysis, Voltage divider