The mixed-cation lead halide perovskites have emerged as a new class of promising light harvesting materials for solar cells.The formamidinium (FA),methylammonium (MA) and Cs cations are widely studied in the field of mixed-cation perovskites.Here,we have investigated ethylammonium (EA) as an alternative cation to fabricate a mixed-cation perovskite of MA1-xEAxPbI3.We have characterized the materials using the X-ray diffraction (XRD),scanning electron microscope (SEM),and UV-vis spectrum.Our results have confirmed the successful incorporation of EA cations into MAPbl3.Interestingly,the optimal amount of EA to achieve the best performance is quite low.This is different from the FA-MA mixed-cation perovskites although EA and FA have similar radii.In short,the EA-MA mixed-cation perovskite has some material and device properties highly distinguishable from the FA-MA one.