Optimization Of The Longitudinal Structure Of Intrinsic Layer In Microcrystalline Silicon Germanium Solar Cell

Using radio-frequency plasma enhanced chemical vapor deposition, based on the influences of discharge power on structural and photoelectric properties of mu c-SiGe:H thin films, RF power profiling technique is developed during the deposition of mu c-SiGe:H intrinsic layer. The optimized mu c-SiGe:H intrinsic layer not only maintains homogeneity of the crystalline volume fraction along the depth profile, but also forms a band gap profiling configuration from wide to narrow in the direction of growth. By this method, the fill factor and the short-circuit current density of mu c-SiGe:H solar cell are significantly improved, and an efficiency of 9.54% for the a-Si:H/mu c-SiGe:H tandem solar cell is achieved.