Metal–Organic Framework‐Assisted Metal‐Ion Doping in All‐Inorganic Perovskite for Dual‐Mode Image Sensing Display
Jin Woo Oh, Hyowon Han, Hong Hee Kim, Hyeokjung Lee, Kyusung Kim, Jiyeon Lee, Jiwon Kim, Won Kook Choi, Cheolmin Park
Abstract
Abstract Crystal engineering based on defect passivation with metal ions doped into halide perovskites is of considerable interest for tailoring the photoelectric properties of perovskites. Herein, a simple and robust approach for doping metal ions into a thin all‐inorganic CsPbBr 3 perovskite film by employing metal–organic framework nanoparticles is presented. Zeolitic imidazolate framework‐8 nanoparticles, which can adsorb water, are dispersed and embedded in a thin perovskite film. The particles self‐decompose at a certain humidity, releasing Zn 2+ ions into nearby perovskite crystals. The Zn 2+ ions efficiently passivate the undercoordinated defect sites of the defective perovskite crystals, resulting in environmentally stable and enhanced photoluminescence of the perovskite with a quantum yield of ≈14%, more than 24 times greater than that without nanoparticles. Further, a thin Zn‐doped CsPbBr 3 film is employed to fabricate arrays of ultraviolet photodetectors, and ≈90% of the initial photocurrent is maintained over 15 d in RH 60%, facilitating the development of a dual‐mode image sensor using which programmed images are visualized based on both photocurrent and photoluminescence.