In bulk heterojunction solar cells, the morphology of the interfaces between photoactive layer and transporting/collecting electrodes during the deposition process play a key role for achieving high efficiency devices. In this work, we present a fully spray coated solar cell realized in inverted architecture on ITO glass substrate and the influence of spray coated transporting layer is evaluated. In particular, we report the realization of a spray coated double electron transporting layer (ETL) using zinc oxide nanoparticles coated with polyethylenimine ethoxylated (PEIE) which allows improving the morphology of the spray coated active layer on top of the spray coated cathode. The approach used in our experiments to realize the hole transporting layer (HTL) and the anode was firstly, a sprayble solution prepared using a blend of two commercial poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). We compared the devices realized using PEDOT:PSS blend with devices prepared using a high conductive anhydrous PEDOT:PSS (A-PEDOT) formulation developed in our laboratory. Optimizing the spray deposition of all the organic layers, we demonstrated the possibility to realize a fully spray scalable process to realize polymer solar cells on ITO with the structure ITO/ZnO/PEIE/PTB7:PCBM/CPP:A-PEDOT that reached a power conversion efficiency of 3.6%. This value was a great result with respect to not fully scalable processes based on spray coated structure with evaporated anode (MoO3-Ag), making. In this case (ITO/ZnO/PEIE/PTB7:PCBM …