New approach of both junction and back surface recombination velocities in a 3D modelling study of a polycrystalline silicon solar cellH. L. Diallo, A. Seïdou Maiga, A. Wereme and G. SissokoEur. Phys. J. Appl. Phys., 42 3 (2008) 203-211DOI: https://doi.org/10.1051/epjap:2008085