It also points out that the higher electricity generating efficiency and lower cost will be obtained if polycrystalline silicon germanium (poly-SiGe) alloys is used as solar energy materials compared with polycrystalline silicon thin film (poly-Si).

• 文章阐明用多晶锗硅薄膜作为太阳能电池材料，能获得比多晶硅薄膜太阳能电池更高的发电效率和更低的成本。