The challenges for solar cells are the life-time,stability and environmental protection. Hydrogenated nanocrystalline silicon (nc-Si∶H) thin film is a very promising material . As a two phases mixed material,nc-Si∶Hcomposes of nano-sized silicon grains embedded in The challenges for solar cells are the life-time, stability and environmental protection. Hydrogenated nanocrystalline silicon (nc-Si: H) thin film is a very promising material. As a two phases mixed material, nc-Si:Hcomposes of nano-sized silicon grains embedded in