Glass frit 첨가에 따른 태양전지 후면전극의 물성변화의 원인 분석

Abstract

An ultra-thin silicon solar cells use a small amount of silicon when compared to conventional silicon solar cells. This means that manufacturing costs are reduced. Eventually, ultra-thin solar cells are superior to general solar cells in terms of power generation cost. However, in sintering process, ultra-thin silicon solar cell faces a bending phenomenon since each layer of the solar cell has different mechanical properties. The main cause of this bending phenomenon is the change in physical properties of the al back contacts and the recrystallized layer (BSF layer + Eutectic layer) generated in the sintering process. In this study, the relationship between a GF(Glass frit) content of aluminum powder and the physical properties of the Al layer used for forming the Al back contacts was researched experimentally. At the same time, the cause of the change of physical properties of Al layer according to GF content was clarified through numerical analysis and experimental results.