150w led floodlight- solar knowledge:

In order to reduce the recombination, the surface is passivated to deactivate the surface impurities. The passivation of solar cells made of crystalline silicon is to passivate both the front and back sides with a chemical solution.

There are unsaturated bonds (dwelling bonds) at the grain boundaries between the grains, and such a structure gives them special results. In the polycrystalline silicon solar cell, the pn junction is broken to generate a leakage current, and a photoelectric effect short circuit occurs. In order to passivate the surface, silicon nitride may be deposited by a CVD method, or the dangling bonds may be passivated by hydrogen using a CVD method.