eng Science and Education Publishing American Journal of Energy Research 2328-7330 2017-10-24 5 2 51 56 10.12691/ajer-5-2-4 AJER2017524 article Influence of the Recombination Assisted by Tunneling Effect and Influence of the Surface Treatment on the Electric Performances of Cu-Rich Solar Cells Based on Cu(In,Ga)Se2 Mouhamadou M. Soce 1 Alain K. Ehemba ehembaalain@yahoo.fr 1 Ousmane Diagne 1 Djimba Niane 1 Moustapha Dieng 1 Physics Department, Faculty of Science and Technology, Laboratory of Semiconductors and Solar Energy, University Cheikh Anta Diop, Dakar In the paper, we study the influence of the tunneling effect recombination inside the interface absorber/ CdS and the effect of surface treatment in the absorber of solar cell CIGS Cu-rich. This study will be done with neutrals defects and charged defects. Whatever the charge of the defect, we noted that the cell efficiency decreases with this recombination and increases with the surface treatment. We have also observed that this surface treatment is more efficient and the recombination by tunnel effect is much more harmful when the defects are charged. http://pubs.sciepub.com/ajer/5/2/4/ajer-5-2-4.pdf tunneling effect recombination charged defect neutral defect and surface treatment