Abstract—We present a simple method to modify the surface morphology of spin coated nickel phthalocyaninetertrasulfonic acid tetrasodium salt (TsNiPc) thin films by means of their immersion in different organic solvents followed by letting them dry under ambient conditions. Photovoltaic devices, based on treated TsNiPc films as donor and perylene-3,4,9,10-tetracarboxylic-3,4,9,10-dianhydride (PTCDA) layers as acceptor, were fabricated and tested. The electrical response of the treated devices under illumination showed significant enhancement and increased short-circuit current density (Isc) compared to the untreated devices. We attributed this electrical improvement to the increased charge carrier transport within the devices’ active area, produced by the modified surface morphology of the donor layer that was caused by the solvent treatment. This morphological variation was found to increase the interfacial area between the donor-acceptor components, thereby promoting a higher yield of photo-generated charge carriers.