The effect of MoSe2 thin films on the solar photovoltaic characteristics of ZnO/ZnS/MoSe2 has been studied. The variation in the efficiency of the solar cells as a funcion of the thickness of the MoSe2 layer, characteristic (J-V), and the quantum efficiency (QE) of the solar cell for different energies of the incident radiation have been studied. The results indicate that when the thickness of MoSe2 is increased the efficiency of MoSe2 based solar cells improves from 9.24% to 17.51%. The output photovoltaic parameters such as the efficiency is found to be 17.51% and a good short circuit current Jsc value of 22.19 mA/cm 2 is attained and the corresponding open circuit voltage Voc is 0.8 V.

Stannous sulphide (SnS) thin films have been synthesised using two different solutions. The solutions were prepared by the dilution of SnCl 2 and thiourea in distilled water and methanol separately. The effects of solvents and deposition time on the properties of the prepared thin films are investigated. X-ray diffraction analysis revealed that the variation of the solvent and the deposition durations alters the structure of the prepared films. The films analysis by scanning electron microscope showed that the SnS films prepared with methanol are more dense and smooth than the SnS films prepared with distilled water. The resistivity depends on the used solvent and their growth duration. The elemental composition of the films deposited during 30 min with methanol indicate that SnS is quasi-stoichiometric, while those prepared with distilled water are slightly Sn rich. We have also found that the films deposited with distilled water are n-type, whereas those prepared with methanol are p-type.

The effect of the buffer layer in two different solar cell configurations such as ZnO/CdS/CIGS and ZnO/SnS/CIGS on the current density (J-V ), generated power (P -V ), and efficiency of the solar cells has been studied. Solar cell with SnS as buffer layer shows better performance and therefore the effect of the ambient temperature on the characteristics of this solar cell has been studied. Additionally, the effect of series and shunt resistance has been studied. The current density, generated power, and the efficiency of the solar cell increase when the buffer layer SnS is used. The thickness of the absorbent layer is also found to affect the efficiency of the solar cell significantly and optimal thickness is found to be 18 µm. We found substantial improvement in power conversion efficiency from 12.5% to 22.5% due to a decrease in series resistance. The increase in the ambient temperature decreases the current density of the solar cells significantly.

No abstract

No abstract