In this work, planar heterojunction organic photovoltaic cells (PHJ-OPVs) based on alpha-sexithiophene (α-6T) and fullerene active materials were investigated. We have studied the effect of hole transporting layer (HTL) performances PHJ-OPVs. The HTLs are molybdenum trioxide (MoO3), cuprous iodide CuI MoO3 coupled with (MoO3/CuI). PHJ-OPVs fabricated using thermal evaporation/sublimation techni...