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Two-dimensional (2D) organic-inorganic perovskites have recently attractedincreasing attention due to their great environmental stability, remarkablequantum confinement effect and layered characteristic. Heterostructuresconsisting of 2D layered perovskites are expected to exhibit new physicalphenomena inaccessible to the single 2D perovskites and can greatly extendtheir functionalities for novel electronic and optoelectronic applications.Herein, we develop a novel solution method to synthesize 2D perovskitesingle-crystals with the centimeter size, high phase purity, controllablejunction depth, high crystalline quality and great stability for highly narrowdual-band photodetectors. On the basis of the different lattice constant,solubility and growth rate between different n number, the newly designedsynthesis method allows to first grow n=1 perovskite guided by theself-assembled layer of the organic cations at the water-air interface andsubsequently n=2 layer is formed via diffusion process. Such growth processprovides an efficient away for us to readily obtain 2D perovskiteheterostructural single-crystals with various thickness and junction depth bycontrolling the concentration, reaction temperature and time. Photodetectorsbased on such heterostructural single crystal plates exhibit extremely low darkcurrent, high on-off current ratio, and highly narrow dual-band spectralresponse with a full-width at half-maximum of 20 nm at 540 nm and 34 nm at 610nm. In particular, the synthetic strategy is general for other 2D perovskitesand the narrow dual-band spectral response with all full-width at half-maximumbelow 40 nm can be continuously tuned from red to blue by properly changing thehalide compositions.

Controllable growth of centimeter-size 2D perovskite heterostructural single crystals for highly narrow dual-band photodetectors