The solar cell wafers are of P-type; why is it required that the polycrystalline silicon be N-type at the time of leaving the factory?
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The solar cell wafers are P-type, so why is it required that the polycrystalline silicon be N-type at the time of production?
The battery wafer is P-type; why is it required that the polysilicon be N-type upon leaving the factory? Why not simply use P-type (boron-doped) silicon material to make solar cells?
This is related to product purification; generally, the purified TCS contains more P than AS. Moreover, since the reaction coefficients for these impurities are different during the reaction in the reduction furnace, the product of this reaction is essentially N-type polysilicon. In other words, in native polysilicon, the contents of group P and group AS are greater than that of group P.