Silicon paste prepared by boron doped Si nanoparticles and organic carriers is used as the source.The Si wafers from the standard process of solar cells are used as the substrate.The Si paste is fully screen-printed on the preprocessed Si rear surface and dried,and then a homogenous B-doped Si cladding layer is formed by picosecond laser.During the process,B diffuses into the substrate.The structure of Si cladding layer and doping performance of B element are observed by laser scanning microscope,scanning e...