The invention discloses a manufacturing process of a solar P-type
polycrystalline silicon wafer. The manufacturing process comprises the following steps: (1) preparing raw materials; (2) preparing a P-type
silicon ingot; (3)
cutting and squaring the
silicon ingot; and (4)
cutting and cleaning the
silicon wafer, wherein the used raw materials comprise a primary silicon material with the purity of 6N, a circulating silicon material and a
doping agent
gallium, the circulating silicon material comprises a circulating silicon plate, a circulating silicon block, a circulating silicon sheet and circulating silicon
powder, the circulating silicon material needs to be subjected to
impurity removal and purification treatment before being used, the edge of a
crucible is filled with the circulating silicon material during
ingot casting, the center of the
crucible is filled with the primary silicon material doped with
gallium, the
doping concentration of
gallium in the primary silicon material is gradually reduced from the bottom of the
crucible to the top of the crucible, the concentration of gallium at the top is zero, the crucible filled with the silicon material is put into a
microwave sintering furnace, and the material is discharged out of the furnace after heating, heat preservation and cooling under the protection of
argon to obtain the P-type silicon ingot uniformly doped with gallium. According to the method, the circulating silicon material is fully utilized, and the prepared silicon
wafer is stable in quality.