Anisotropic carrier dynamics and laser-fabricated luminescent patterns on oriented single-crystal perovskite wafers

Abstract

Perovskite materials and their applications in optoelectronics have attracted intensive attentions in recent years. However, in-depth understanding about their anisotropic behavior in ultrafast carrier dynamics is still lacking. Here we explore the ultrafast dynamical evolution of photo-excited carriers and photoluminescence based on differently-oriented MAPbBr3 wafers. The distinct in-plane polarization of carrier relaxation dynamics of the (100), (110) and (111) wafers and their out-of-plane anisotropy in a picosecond time scale were found by femtosecond time- and polarization-resolved transient transmission measurements, indicating the relaxation process dominated by optical/acoustic phonon interaction is related to photoinduced transient structure rearrangements. Femtosecond laser two-photon fabricated patterns exhibit three orders of magnitude enhancement of emission due to the formation of tentacle-like microstructures. Such a ultrafast dynamic study carried on differently-oriented crystal wafers is believed to provide a deep insight about the photophysical process of perovskites and to be helpful for developing polarization-sensitive and ultrafast-response optoelectronic devices.

Methylamine Gas Sensor Based on Fluorescent Perovskite Nanocrystal Nanofibers Incorporating Aggregation-Induced Emission Materials

“…Upon the introduction of (S)-OBN-tCz, these defects are effectively passivated, restoring or improving the electronic environment around Pb 2+ ions. This results in a shift in the binding energy peak Figure d provides a schematic representation of the bromine and lead elemental composition and chemical states in the perovskite MAPbBr 3 and MAPbBr 3 &(S)-OBN-tCz as analyzed by XPS.…”

“…This results in a shift in the binding energy peak. 38 Figure 2d provides a schematic representation of the bromine and lead elemental composition and chemical states in the perovskite MAPbBr 3 and MAPbBr 3 &(S)-OBN-tCz as analyzed by XPS.…”