The μc-Si:H films were deposited by VHF-PECVD,the effects of silane concentration,power density,deposition pressure and total flow rate on the deposition rate and crystallization of μc-Si:H were extensively studied.Phase diagram in the plot of deposition pressure against power was determined.The deposition rate of μc-Si:H has reached 0.75?nm/s.Incorporating such μc-Si:H films as i-layer,the single-junction solar cell on glass substrate showed an conversion efficiency of 5.5%.