PERC battery cell process
1.1 Laser doping
Application background and function：PERC is suitable for single 、 Polysilicon batteries
Laser doping principle：
Laser acts on doping sources(Passivation layer)and silicon wafer surface，Using laser melting principle，The doped atoms of the precoated layer diffuse to the surface of the silicon substrate，Form a heavily doped region，Make good ohmic contact between the front of the silicon battery and the metal。
1.2 Laser film opening
Application background and function：PERC& IBC， Suitable for single 、 Polysilicon batteries
The role of laser：
Selectively remove the insulating layer of the back passivation film using the principle of instantaneous pulse thermal effect of laser，Make the aluminum paste in full contact with the silicon matrix，Form good ohmic contact，This improves FF (filling factor) and pressure opening。
