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Articles by Nahida B. Hasan
Total Records ( 2 ) for Nahida B. Hasan
  Rusul A. Ghazi and Nahida B. Hasan
  In this research, Cd1-xZnx S thin films were prepared by spray pyrolysis technique on silicon substrate at a temperature 360oC. The reverse bias capacitance for Cd1-xZnx S/n-Si heterojunciton was measured as a function of bias voltage at frequency 1MHz . The capacitance decreases with increasing of reverse bias voltage and increase with vol. of (x), it increases from 334-577 pF with increase of the (x) while the depletion width decreasing with increasing (x). We noted that these heterojunction are abrupt and the value of built-in potential decreases from 0.7-0.27 V with increasing of the ZnS vol.%. The sensitivity as a function of operating temperature in the range 100-300°C for Cd1-xZnx Sthin films were prepared by spray pyrolysis technique on glass substrate at 360°C. It is obvious that the sensitivity of all films increases with increasing of the operating temperature.
  Ehsan A. Mohammad , Nahida B. Hasan and Mohammed Hadi Shinen
  Optical properties includes measurements of absorbance and transmittance spectra as a function of wavelength for films prepared from combination P3HT solution with multiwall carbon nanotubes then calculating the absorption coefficient and other optical constants. These films prepared with different concentrations ratio of multiwall carbon nanotubes added to P3HT (0.00025, 0.00050 and 0.00075 g). The values of absorbance, absorption coefficient and refractive index values for pure and doped polymer are increasing with increasing of the concentrations ratio of MWCNTs. The results showed decreasing values of transmittance with all concentrations ratio of MWCNTs, the values of reflectance are increases with increasing of concentration ratio, also results showed decrease of energy gap for allowed direct transition with increasing of doping ratio.
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