Improved seeded directional solidification process for producing high-efficiency multi-crystalline silicon ingots for solar cells

2014 ◽  
Vol 130 ◽  
pp. 118-123 ◽  
Author(s):  
Xiaofang Qi ◽  
Qinghua Yu ◽  
Wenhan Zhao ◽  
Xueqin Liang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Directional Solidification ◽  
High Efficiency ◽  
Crystalline Silicon ◽  
Solidification Process ◽  
Directional Solidification Process

SIMS Study of C, O and N Impurity Contamination for Multi-Crystalline Si Solar Cells

2008 ◽  
Vol 1123 ◽  
Author(s):  
Larry Wang ◽  
R. S. Hockett
Keyword(s):  
Solar Cells ◽  
Directional Solidification ◽  
Solidification Process ◽  
Directional Solidification Process ◽  
Si Solar Cells ◽  
Impurity Contamination

AbstractThis paper is a case study of using SIMS to quantitatively measure C, O and N impurity contamination at two sequential commercial process steps: (1) Si feedstock: 7N (modified Siemens) and 5N feedstock (UMG-Si); and (2) multi-crystalline (mc-Si) solar wafers: cut and etched, from directional solidification bricks grown from 7N and 7N/5N (80:20) feedstock. The conclusion of this study is twofold: (a) the primary opportunity to reduce C, O and N contamination in mc-Si solar cells is at the directional solidification process, and (b) the costly specification of highly pure Si feedstock is unnecessary from a C, O and N perspective if a directional solidification process is used.

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