Abstract
Hybrid organic-inorganic halide perovskite, CH3NH3Pb1-xCdxBr3 (x = 0, 0.05, 0.08, 0.10) semiconductor crystals were synthesized using a low temperature assisted crystal growth method. The cubic (Pm-3m) structure was maintained throughout the doping range. At low concentrations the Cd2+ doping exhibited lattice expansion, while at higher dopant concentration the structure reverted back to that of the undoped composition. The non-monotonic doping dependence was reflected in the shift of bond vibrational modes, minimum in bandgap, and longer average photoluminescence lifetime decay τavg in the 5% doped sample. Photoluminescence (PL) spectroscopy showed a shift in the luminescence peak from 580 nm to 602 nm for 0% and 10% Cd doped respectively. Time resolved photoluminescence (TRPL) gave an average time decay constant τavg = 1–3 ns and diffusion length LD ∼1.1 μm. The dielectric response exhibited a dynamic frequency and temperature dependence of the methylammonium (MA+) dipole moment.
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