| abstract |
The present invention relates to a kind of methods for preparing the solar battery sheet for PERC imbrication component, comprising the following steps: provides silicon wafer step, provides silicon wafer as the raw material for preparing solar battery sheet；Diffusion step forms the interface of N-type semiconductor and P-type semiconductor, i.e. PN junction on silicon wafer；Passivation step is carried on the back, applies one layer of back passivating film at the back side of silicon wafer；Back protection film step is plated, layer protecting film is deposited on back passivating film by PECVD method；Laser grooving step is slotted by being laser-ablated in back passivating film and back protection film, exposes silicon wafer；Screen printing step, wherein carry out silk-screen printing using front of the Precious Metal to silicon wafer, obtain main gate line and secondary grid line；Silk-screen printing is carried out using only the back side of the aluminium paste to silicon wafer, realizes the Al-BSF covering of solar battery sheet；And Fast Sintering step, Ohmic contact is formed, can collect and externally conduct photo-generated carrier.The invention further relates to the solar battery sheets for PERC imbrication component. |