Abstract
► A dye-sensitized solar cell based on nanostructure TiO
2 coated with PCBM:P3HT blends was fabricated. ► The photovoltaic properties at different illumination intensities were measured and analyzed. Also, the photovoltaic parameters were extracted. ► Impedance spectroscopy including capacitance–voltage, the conductance–voltage, the series resistances–voltage characteristics of the DSSC solar cell were measured in a wide range of frequency for the first time. ► Negative capacitance was found in the studied cell and was intercepted based on the DSSC structure for the first time. ► The photovoltaic performance of the dye-sensitized solar cell can be improved using various organic semiconductors.
A dye-sensitized solar cell based on nanostructure TiO
2 and PCBM:P3HT blend was fabricated and the photovoltaic and impedance spectroscopy properties of the solar cell were investigated. The solar cell gives a short circuit current density of 0.75
mA/cm
2 and an open circuit voltage of 0.60
V under AM1.5. The photovoltage of the solar cell was greatly enhanced by PCBM:P3HT blend. The capacitance–voltage, the conductance–voltage, the series resistances–voltage characteristics of the solar cell were measured in a wide range of frequency for the first time for DSSC applications. The capacitance–voltage shows a behavior from the positive to negative capacitance due to injection of electrons from the FTO electrode into TiO
2. It is evaluated that the photovoltaic performance of the dye-sensitized solar cell can be improved using various organic semiconductors.