Impedance spectroscopy studies on CuPc/n-Si hybrid solar cell

Impedance spectroscopy of copper phthalocyanine (CuPc)/n-Si hybrid solar cell was studied. The dielectric relaxation mechanism of the solar cell was analyzed by Cole–Cole plots, indicating the presence of a single relaxation mechanism. The equivalent circuit model consisting of a parallel resistor and capacitor in series with a resistor was found to give a well fit to the experimental data. The conduction mechanism was suggested to be a space-charge limited current with exponential trap distribution. Beside, the dielectric relaxation time of the device was decreased with increasing applied bias voltages.

Graphical AbstractThe figure shows the current–voltage characteristic of the Au/CuPc/n-Si/Al hybrid solar cell under illuminated conditions using a simulated solar light (AM1.5) with 100 mW/cm2. The 0.04 cm2 active cell area was used for the present investigation. Note that the structure and fabrication processing of this solar cell are consistent with that of the solar cell in the manuscript, but they are not the same samples.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We have investigated the impedance characteristics of Au/CuPc/n-Si/Al solar cell. ► The solar cell was modeled with the equivalent circuit. ► It consists of a parallel resistor and capacitor in series with a resistor. ► The conduction mechanism was found. ► It was a space–charge limited current with exponential trap distribution