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Efficient polycrystalline ingot

Efficient polycrystalline square rod is a polycrystalline material produced by directional solidification growth method using polycrystalline ingot furnace, mainly used for preparing low attenuation and high conversion efficiency solar cells. Efficient polycrystalline square bars with high purity, low cost, and crystal structure that meet the requirements are prepared through processes such as spraying, loading, furnace feeding, heating, melting, crystal growth, annealing, cooling, demolding, square opening, inspection, cutting, grinding, chamfering, and secondary inspection.

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Serial Number	Project	Specifications	Test method
Material Propeties
1	Growth Method	Directional solidification of ingot	-
2	Dopant	Boron doped	-
3	Type	P-Type	Napson EC-80TPN
4	Oxygen content	≤5.0×1017 atoms/cm3	FTIR(ASTM F121-83)
5	Carbon content	≤7.0×1016 atoms/cm3	FTIR(ASTM F123-91)
6	Impurities（mm）	Size ≤ 2 and number ≤ 5	PlB R55i
Electrical Propeties
1	Resistivity	0.8-2 Ω·cm	RT-1000
2	Silicon rod minority lifetime	≥6.0us	WT2010D

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