A Study on the Effect of Resistivity of Deionized Water Used in the Deposition of Cds (Cadmium Sulphide) Layer for the Fabrication of CIGS (Copper Indium Gallium Diselinide) Solar Cell

CIGS solar cell has been of immense research interest because of its potential to become a low cost solar cell in coming days. CdS deposition, is a buffer layer, is an n type material to form a p-n junction with CIGS absorber layer. The CdS buffer layer is commonly deposited by chemical bath deposition. Often there are white patches observed with the deposited yellow CdS layer. A study is done to correlate the resistivity of DI (deionised) water, used in making the solution for chemical bath deposition, with the whitish patches. It is found that a higher resistivity (> 15 MΩcm) DI shows a negligible white patches formation whereas film deposited using low resistivity DI water (∼3MΩcm) shows high tendency for white patch formation.