In contrast to the monocrystalline cell, the polycrystalline cell is made of polysilicon. Silicon is heated, poured into a mold and then cut to size. The module is typically blue and visually quite uneven.
The polycrystalline solar module is now gradually disappearing from the market. The efficiencies are worse and the performance values per module are also limited. The only advantage is that they are easier to manufacture.