CHEMICAL BATH DEPOSITION OF CDS BUFFER LAYER FOR CIGS SOLAR-CELLS

We investigated the chemical bath deposition of CdS thin Rims on the C u(In,Ga)Se-2 (CIGS) absorber layers and glasses. The process of the ch emical bath deposition of CdS layer affected the performance of the CI GS solar cells. The CdS layers were deposited on the CIGS film from Cd I2, thiourea (NH2CSNH2) and ammonia solutions. The influence of pH on the chemical bath deposition process was studied. The surfaces of the CdS films were observed by scanning electron microscopy (SEM) and atom ic force microscopy (AFM). The compositions of the obtained CdS layers were analyzed by Anger electron spectroscopy (AES). The performance o f the CIGS solar cells was discussed on the basis of the characteristi cs of the chemical bath deposited layer. We have successfully fabricat ed a high-efficiency CIGS solar cell with an efficiency of 17% using a CdS layer with stoichiometric composition.