Photoluminescence Study of the Photoinduced Phase Separation in Mixed-Halide Hybrid Perovskite CH₃NH₃Pb(Br_xI_1-x)₃ Crystals Synthesized via a Solvothermal Method.

ABSTRACT: We systematically synthesized mixed-halide hybrid perovskite CH₃NH₃Pb(Br_xI_1-x)₃ (0 ≤ x ≤ 1) crystals in the full composition range by a solvothermal method. The as-synthesized crystals retained cuboid shapes, and the crystalline structure transitioned from the tetragonal phase to the cubic phase with an increasing Br-ion content. The photoluminescence (PL) of CH₃NH₃Pb(Br_xI_1-x)₃ crystals exhibited a continuous variation from red (768 nm) to green (549 nm) with increasing the volume ratio of HBr (V_HBr%), corresponding to a variation in the bandgap from 1.61 eV to 2.26 eV. Moreover, the bandgap of the crystals changed nonlinearly as a quadratic function of x with a bowing p

SUBMITTER: Zhang B 

PROVIDER: S-EPMC5735176 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature