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MONOCRYSTALLINE WAFERS

NorSun produces single crystal silicon wafers from high purity grade silicon raw material. The wafers are used in the production of high efficiency solar cells.

 

NorSun’s wafers are customized according to the individual customer’s specifications. NorSun works closely with the customers in order to identify the wafer specification that minimizes the cell cost on a Wp level, and thus contributes to optimization across the value chain to reduce production cost per Wp.  

 

The efforts of solar cell manufacturers to increase conversion efficiency leads to a continuous tightening of wafer specifications. NorSun is one of only a handful wafer suppliers meeting the stringent specifications of the high efficiency cell producers.

 

The unique customer experience NorSun delivers is based on the following:

Premium polysilicon from reputed suppliers combined with proven crystal growing technology from the semiconductor industry

Using only premium polysilicon from reputed suppliers in combination with semiconductor-based crystal growing technology, NorSun wafers benefit from low levels of co-doping, carbon, metals and crystalline defects. This results in high minority carrier lifetime.

Very accurate ingot shaping equipment with low kerf loss

Using very accurate ingot shaping equipment for square sawing and grinding, NorSun wafers benefit from: 

-  Tight tolerances on wafer side length, diameter and corner length

- Polished ingot surface with low roughness promoting low wafer breakage

- Low kerf loss due to thin band saw blades, promoting low silicon consumption per Wp

State-of-the-art wafer slicing and cleaning equipment with low levels of surface metals and 100 % automatic wafer inspection

Using state-of-the-art wafer slicing equipment, NorSun wafers benefit from low average wafer total thickness variation (TTV) and saw marks, as well as low surface roughness. In addition, the state-of-the-art automatic wafer singulation and inline cleaning solution gives consistent wafer cleanliness and low surface metal content. NorSun also has 100 % inline automatic wafer inspection.

Organization accustomed to handling customer-specific specifications undergoing rapid development

NorSun’s customers produce high efficiency cells. These customers are characterized by having very different and very tight specifications that undergo continuous rapid development. Our team of engineers and operators are used to handling this variety and aim at working together with the customers to give advice and optimize production costs across the value chain for mutual benefits.

 

Process innovations delivering cost reduction as well as quality improvements

NorSun aims at cost reduction through process innovations. Some of these innovations will also benefit the customers through improved products. For example, planned process innovation initiatives will further tighten the resistivity specification and reduce both wafer total thickness variation (TTV) and wafer surface metal content.