There is no essential difference between the front of TOPCon solar cell and conventional N-type solar cell or N-PERT solar cell, which is boron (p+) emitter, passivation layer, and antireflection layer. The core technology of the battery is the back passivation contact. The back of the silicon wafer is composed of an ultra-thin layer of silicon oxide (1-2 nm) and a layer of phosphorus-doped microcrystalline amorphous mixed silicon film. Considering the double-sided application, metallization is carried out by printing Ag or Ag-Al grids on the front and Ag-grid on the back.

Tunneled oxide passivation contact (TOPCon) is a kind of structure that has attracted much attention recently because it achieves a high conversion efficiency of 25.7% 8. TOPCon structure is composed of thin tunnel oxide and phosphorus (P) doped polysilicon layer. The P-doped polysilicon layer can be made by crystallizing a-Si: H 9 or directly depositing polysilicon using LPCVD 10. TOPCon solar cell is a promising candidate for high-efficiency solar cell technology.

✔ IV Tester       ✔ EL/PL Tester       
✔ Scanning Electron Microscope