Modeling and optimization of n-ZnO/p-Si heterojunction using 2-dimensional numerical simulation Mohamed Manoua, Tariq Jannane, Otmane Abouelala, Nejma Fazouan, Abdelmajid Almaggoussi, Najoua Kamoun and Ahmed Liba Eur. Phys. J. Appl. Phys., 90 1 (2020) 10101 Published online: 13 May 2020 DOI: 10.1051/epjap/2020190333