Influence of the sulfurization-selenization process on CuIn(S, Se)_2 thin film solar cells from screen printing of oxide nanoparticle based inks – (PPT)

摘要

Viability of screen printing of oxide nanoparticle based inks to obtain band gap graded CISSe layers is demonstrated. The order of the sequential thermal process of chalcogen incorporation has strong influence, leading to the formation of single phase Se-rich CuIn(S, Se)_2 (sulfurization + selenization) or to the formation of graded band gap CISSe (selenization + sulfurization) with a S-rich surface region and a gradual decrease of the S/(S+Se) ratio in depth. Further investigations are necessary to improve the compactness and crystallinity of the absorbers and prevent the degradation of the Mo back contact that are likely limiting the 2.2% maximum solar cell efficiency.