Silicon wafer, solar cell, cell module, photovoltaic system and silicon rod

The invention is suitable for the technical field of solar cells, and provides a silicon wafer, a solar cell, a cell module, a photovoltaic system and a silicon rod. The silicon wafer comprises a central region and corner edge regions, the conductive type of the central region is N type, and the conductive type of the corner edge regions is P type. Therefore, the conduction type of the central area of the silicon wafer is N type, and the conduction type of the corner edge area is P type, so that in the process of manufacturing the solar cell based on the silicon wafer, the P-type corner edge area can be utilized to bear pollution of copper ions to the edge of the silicon wafer, and recombination caused by pollution of the copper ions to the edge of the silicon wafer is reduced. Meanwhile, PN junctions can be formed in the silicon wafer, and after a solar cell is manufactured, a better field passivation effect can be formed in the solar cell, and carrier transmission is facilitated. Therefore, the photoelectri