Al-density variation as one driving force for void formation in PERC solar cells

作者：Horbelt Renate; Ebert Stefanie^*; Ulbikaite Vaidvile; Hahn Giso; Job Reinhart; Terheiden Barbara

来源：Physica Status Solidi-Rapid Research Letters, 2016, 10(7): 515-519.

DOI：10.1002/pssr.201600078

• Al paste
• Si
• Kirkendall effect
• passivated emitter rear contact
• PERC
• solar cells
• void

The reduction of void formation in local Al contact structures is of high interest in studies dealing with passivated emitter and rear contact (PERC) solar cells. So far, several processing parameters and their impact on local contact formation were investigated in detail. However, up to now density variation of Al in dependence on temperature and Si content in the melt were not taken into account as a principal reason for void formation. In this context the current assumption of a constant volume of the Al paste particles is discussed in more detail. Based on the results of energy dispersive X-ray spectroscopy, void formation implies either an expansion of paste particles or their burst during contact formation.

• 出版日期2016-7