Photoacoustic Study of CdS quantum Dots for Photovoltaic Applications

S. Abdallah, N. Al-Hosiny, A. Badawi
Taif University, SA

Keywords: CdS quantum dots, solar cells, photoacoustic spectroscopy, optical properties

Summary:

Recently, CdS quantum dots (QDs) have become one of the promising materials for high efficiency photovoltiac solar cell.. In this work we investigate the optical properties and photovoltaic characterization of CdS QDs -sensitized solar cells (QDSSCs).The sizes of the obtained samples (1-4) were estimated using transmission electron microscope . Photoacoustic spectroscopy (PA) was employed to study the optical properties of the samples . The PA spectra for the different particle size samples (1-4) were recorded in the wavelength range 400–700 nm. The sizes of the CdS QDs were calculated using the effective mass approximation (EMA) model giving radii ranging from 2.1 to 2.55 nm, these values are comparable to those obtained by transmission electron microscope (TEM) . Furthermore, we describe the fabrication and photovoltaic characterization of CdS QDs-sensitized solar cells (QDSSCs). The short current density (Jsc) and efficiency (η) increase with the increasing the particle size. The values of Jsc increases linearly with increasing the intensities of the sun light which indicates the stability of the assembled cells.