Capacitance and Dielectric Properties of Mn Doped CdO Photodetectors

Abstract

CdO solution was produced using sol-gel technique and doped with Mn in 0.2 %, 6 % and 10 % molar concentrations, respectively. Mn doped and undoped CdO solutions were coated on Si substrates and glass surfaces for characterization. Capacitance -Time (C-T) characterizations were performed to assess the photo capacitance properties of detectors where good photo capacitance properties were confirmed. Photo capacitance properties revealed that photodetectors give good photoresponse and show increasing capacitance trend with increasing illumination intensities. The highest capacitance was observed at 100mW/cm2 illumination. Dielectric properties were investigated as a function of AC signal frequency. Dielectric permittivity (ε′) and dielectric loss (ε″) were assessed. It was seen that both dielectric permittivity constant (ε′) decreases with increasing AC frequency.  Dielectric loss (ε″) shows totally different behavior than that of dielectric constant. Dielectric loss (ε″) values were found to increase with diminishing AC frequency.