Publication date: 15th July 2022
Two-dimensional layered metal halide perovskites (2D-LMHP) represent unique optoelectronic properties, which renders this materials class for potential applications like photovoltaics, photodetectors, and LEDs.[1] Their structure comprises inorganic octahedral layers separated by bulky organic ammonium cations that result in strong dielectric and quantum confinement effects.[2] In modern optoelectronic devices, heterostructures consisting of at least two materials with distinct band alignment can improve charge carrier generation and transport, as well as light emission.[3] The low mobility of halide anions in 2D-LMHP compared to the 3D counterparts significantly suppresses the interdiffusion across the heterojunction, opening a pathway toward the formation of stable heterojunctions. Furthermore, 2D-LMHPs have better environmental stability than 3D perovskites and represent better tunability of their optoelectronic properties.[4] Here, a facile two-step solution-based method is presented for the formation of microcrystalline PEA2PbX4-PEA2PbX4 (X = Br, I) lateral heterostructures at room temperature. The first step consists of the preparation of the parent PEA2PbX4 structure.[5] Subsequently, the heterostructure is formed by exposing the parent structure to the respective ion source in a mixture of polar and nonpolar solvents via mechanical shaking. We studied the influence of different solvent mixtures, the respective ion sources as well as the concentration of the ion sources on the morphology, composition, and optical properties of the 2DLP heterostructures. Our work paves the way for the generic fabrication of lateral heterostructures based on 2D-LMHP, which ultimately could translate to potential applications in photovoltaics, transistors, lasers, and diode devices.
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