Solar cell sheet and preparation method thereof, solar cell string and photovoltaic module

A method for preparing a solar cell sheet, comprising:

• providing a first through hole in a monocrystalline silicon wafer, the monocrystalline silicon wafer comprising first and second surfaces which are opposite;
• performing a texturing operation and a cleaning operation on both of the first and second surfaces;
• forming a first passivation layer and a first doped layer on the first surface sequentially, and forming a second passivation layer and a second doped layer on the second surface sequentially;
• forming a first transparent conductive layer on a surface of the first doped layer away from the first passivation layer, and forming a second transparent conductive layer on a surface of the second doped layer away from the second passivation layer;
• and
• preparing a first electrode on a surface of the first transparent conductive layer away from the first doped layer, preparing a second electrode on a surface of the second transparent conductive layer away from the second doped layer, and preparing a conductive connection member located in the first through hole when preparing the first electrode or preparing the second electrode, such that one end of the conductive connection member is connected to the first electrode, and the other end of the conductive connection member extends to a side of the second transparent conductive layer adjacent to the second electrode.