Polycrystalline silicon solar cells both monocrystalline silicon cell high conversion efficiency and long life and amorphous silicon thin film battery material preparation process is relatively simple and other advantages of a new generation of batteries, the conversion efficiency is generally about 15%, slightly lower than the single crystal silicon Solar cells, there is no significant efficiency of the problem, and may be prepared in cheap substrate materials, the cost is much lower than the monocrystalline silicon cells, and the efficiency is higher than the amorphous silicon thin film batteries.
Due to the presence of grain boundaries and the rapid growth of crystal, the homogeneity of the quality of polysilicon films is poor, and the impurity and defect concentration at the grain boundaries are higher. Coupled with the crystal grain orientation of the inconsistency, can not use anisotropic chemical corrosion method to form an effective suede, so for a long period of time polysilicon battery conversion efficiency than monocrystalline silicon cell conversion efficiency is much lower. In recent years, with the understanding of polysilicon materials continue to deepen the polysilicon material processing and battery technology made a lot of improvements, so that the conversion efficiency of polysilicon batteries has been rapidly improved. Large-scale industrial production conversion efficiency can reach more than 18%.