In this study, we characterize the crystal structure and optoelectronic properties of the hybrid organicinorganic perovskite CH3NH3PbBr3 fabricating by precursor solution-dipping on glass/FTO/PEDOT:PSS substrate. Structural analysis results reveal that the as-fabricated perovskite ismicrosized single crystal particles, belonging to the cubic crystal system in space group Pm m, with lattice parameters of a = b = c = 5.92 Å, = = = 90o, V = 207.42 Å3 and having a preferred orientation of (n00) representing by the corresponding high-intensity diffraction peaks. The crystals show a relatively strong absorption with an optical energy band gap of Eg = 2.99 eV. The I - V characterization for the crystals exhibits strong current responses under excited-light irradiation. This work is proposed to offer a potential opportunity for efficient micro optoelectronic devices based on microsized CH3NH3PbBr3 single crystals