Abstract
Lead sulfide (PbS) films were deposited on polymide (PI) plastic substrate chemical spray pyrolysis technique at substrate temperature in the range 250-350 oC. Effects of substrate temperature on the electrical properties of the films were studied. In addition, the effect of nano surface topography on electrical properties of PbS films was studied. The deposited films were analyzed with atomic force microscope and Hall measurements to determine their electrical characteristics. AFM data shows that the root mean square (RMS) surface roughness of the PbS film increases with increasing substrate temperature. At room temperature, electrical resistivity of the PbS films varies from 9.54x103 to 1.14x103 Ω.cm, respectively.
Highlights
PbS is a IV-VI compound semiconductor has a cubic lattice with unit cell face center cube [1,2,3]
Research on PbS on flexible polymeric substrates such as polyimide (PI) is gaining immense interests due to their flexibility, light-weight, low-cost, high temperature resistance, low coefficient of thermal expansion (CTE), low moisture uptake and high moisture release characteristics, excellent electrical properties and increased voltage endurance [10]
It should be noted that the root mean square (RMS) surface roughness increases with increasing substrate temperature
Summary
PbS is a IV-VI compound semiconductor has a cubic lattice with unit cell face center cube [1,2,3]. These semiconductor materials have important properties as direct band gap and narrow gap with band gap energy of 0.4 eV. PbS thin films have been used in a lot of applications, including electronic and optoelectronic devices [4,5,6]. Thin films of PbS have been prepared with various physical and chemical thin film deposition techniques, such as chemical bath deposition [7], physical vapor deposition [8] and spray deposition [9]. Properties of the PbS thin films was observed. The results obtained has been compared and discussed with the specified results by several researchers
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