Quasi-two-dimensional(quasi-2D)metal halide perovskite(MHP)ferroelectrics,characterized by spontaneous polarization and semiconducting properties,hold promise for functional photoferroelectrics in applications such as...Quasi-two-dimensional(quasi-2D)metal halide perovskite(MHP)ferroelectrics,characterized by spontaneous polarization and semiconducting properties,hold promise for functional photoferroelectrics in applications such as optical storage and in-memory computing.However,typical quasi-2D perovskite films contain multiple quantum wells with random width distribution,which degrade optoelectronic properties and spontaneous polarization.Here,we introduce phase-pure quantum wells with uniform well width by incorporating the inorganic salt MnBr_(2),which effectively controls crystallization kinetics and restricts the nucleation of high n-phases,producing high-quality films.The resulting(BA)_(2)CsPb_(2)Br_(7)(BA=C_(4)H_(9)NH_(3))film demonstrates ferroelectric hysteresis behavior,clear in-plane ferroelectric domain switching,and a high photoluminescence quantum efficiency(PLQE)of 88.7%.Significantly,we observed a nonvolatile,reversible in situ photoluminescence(PL)modulation of Mn^(2+)in this ferroelectric MHP film under an applied electric field,attributed to lattice distortion from ferroelectric polarization orientation.These findings enabled the development of a simple system comprising gallium nitride(GaN)light emitting diodes(LEDs)and ferroelectric films to implement multi-state signal encoding and a logic AND gate.This work advances the fabrication of efficient ferroelectric MHP films and highlights their potential for advanced optoelectronic applications.展开更多
基金supported by the National Key R&D Program of China[2021YFA0715600]National Natural Science Foundation of China[62121005,62425408,U22A2084,62404221]+2 种基金Youth Innovation Promotion Association of CAS[2023223]Natural Science Foundation of Jilin Province[20230101345JC,20230101360JC,SKL202302026]Young Elite Scientist Sponsorship Program by CAST[YESS20200182]。
文摘Quasi-two-dimensional(quasi-2D)metal halide perovskite(MHP)ferroelectrics,characterized by spontaneous polarization and semiconducting properties,hold promise for functional photoferroelectrics in applications such as optical storage and in-memory computing.However,typical quasi-2D perovskite films contain multiple quantum wells with random width distribution,which degrade optoelectronic properties and spontaneous polarization.Here,we introduce phase-pure quantum wells with uniform well width by incorporating the inorganic salt MnBr_(2),which effectively controls crystallization kinetics and restricts the nucleation of high n-phases,producing high-quality films.The resulting(BA)_(2)CsPb_(2)Br_(7)(BA=C_(4)H_(9)NH_(3))film demonstrates ferroelectric hysteresis behavior,clear in-plane ferroelectric domain switching,and a high photoluminescence quantum efficiency(PLQE)of 88.7%.Significantly,we observed a nonvolatile,reversible in situ photoluminescence(PL)modulation of Mn^(2+)in this ferroelectric MHP film under an applied electric field,attributed to lattice distortion from ferroelectric polarization orientation.These findings enabled the development of a simple system comprising gallium nitride(GaN)light emitting diodes(LEDs)and ferroelectric films to implement multi-state signal encoding and a logic AND gate.This work advances the fabrication of efficient ferroelectric MHP films and highlights their potential for advanced optoelectronic applications.
