The electrical characteristics of nanostructured Copper (I) Iodide (CuI) thin films sprayed at different substrate temperatures

Mister atomizer technique or so called spray pyrolysis has been applied to deposit CuI thin films on amorphous substrate. The effects of substrate temperature (RT- 200°C) on their electrical and optical properties were studied. The physical characteristics of sprayed CuI were determined by field emission scanning electron microscopy (FESEM), current voltage (I-V) measurement and UV-VIS-NIR spectrophotometer. The nanoparticle of CuI was observed at different deposition condition. The effect of substrates temperature on thickness and resistivity proved that both decreases as the substrate temperature increased. This was caused by the increase of carrier concentration at higher substrate temperature. The transmittance and absorption coefficient was measured and then the energy gap was determined which shows the direct transition of n=2. The optimum band gap observed here is 2.75 eV at 150°C of substrate temperature.