Temperature-dependent photoluminescence on organic inorganic metal halide perovskite CH3NH3PbI3–x Clx prepared on ZnO/FTO substrates using a two-step method**Project supported by the International Science and Technology Cooperation Program of Science and Technology Bureau of Changchun City, China (Grant No. 12ZX68).

Abstract

Temperature-dependent photoluminescence characteristics of organic-inorganic halide perovskite CH NH PbI Cl films prepared using a two-step method on ZnO/FTO substrates were investigated. Surface morphology and absorption characteristics of the films were also studied. Scanning electron microscopy revealed large crystals and substrate coverage. The orthorhombic-to-tetragonal phase transition temperature was ∼140 K. The films’ exciton binding energy was 77.6 ± 10.9 meV and the energy of optical phonons was 38.8 ± 2.5 meV. These results suggest that perovskite CH NH PbI Cl films have excellent optoelectronic characteristics which further suggests their potential usage in perovskitebased optoelectronic devices.