Abstract
Two-dimensional (2D) halide perovskite has attracted widespread attention because of their structural diversity and adjustable material properties. Their material properties are closely related to structural features, especially the inorganic layers (n) in each structural unit of 2D halide perovskite. The optical properties of 2D perovskite that vary with n can be used to manufacture various optoelectronic devices. This review introduces the basic structure and properties of 2D halide perovskite and then summarizes various experimental methods that can be used to directly or indirectly identify the n value, such as X-ray diffraction (XRD), grazing incidence wide-angle X-ray scattering (GIWAXS), photoluminescence spectra (PL), ultraviolet–visible spectra (UV–vis), atomic force microscopy (AFM), second harmonic generation (SHG) spectroscopy or third harmonic generation (THG) spectroscopy, etc. Moreover, the existence of different n-value phases in 2D halide perovskites has been discussed in terms of the energy transfer characteristics. Finally, we summarize advantages and disadvantages of characterization methods and some issues that still need to be explored in the 2D halide perovskite itself.
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