Sputtered Mo/Sb_2Te_3 and Ni/Sb_2Te_3 layers as back contacts for CdTe/ CdS solar cells

摘要

A sputtered Sb-Te modification is identified as a metastable precursor phase of Sb_2Te_3. The transformation of Sb-Te into monophase Sb_2Te_3 is characterized by XRD measurements. A simple thermodynamic assessment is introduced for estimating the chemical stability of Ni/Sb_2Te_3 and Mo/Sb_2Te_3 double layers. These data and the results of kinetic test reactions for Ni/Sb-Te, Ni/Sb_2Te_3,Mo/Sb-Te and Mo/Sb_2Te_3 layers are used to provide a framework for the development of metal/telluride back Contact systems for CdTe/CdS thin film solar cells with an improved long-term stability.