Two‐Dimensional Materials for Halide Perovskite‐Based Optoelectronic Devices

Abstract

Halide perovskites have high light absorption coefficients, long charge carrier diffusion lengths, intense photoluminescence, and slow rates of non-radiative charge recombination. Thus, they are attractive photoactive materials for developing high-performance optoelectronic devices. These devices are also cheap and easy to be fabricated. To realize the optimal performances of halide perovskite-based optoelectronic devices (HPODs), perovskite photoactive layers should work effectively with other functional materials such as electrodes, interfacial layers and encapsulating films. Conventional two-dimensional (2D) materials are promising candidates for this purpose because of their unique structures and/or interesting optoelectronic properties. Here, we comprehensively summarize the recent advancements in the applications of conventional 2D materials for halide perovskite-based photodetectors, solar cells and light-emitting diodes. The examples of these 2D materials are graphene and its derivatives, mono- and few-layer transition metal dichalcogenides (TMDs), graphdiyne and metal nanosheets, etc. The research related to 2D nanostructured perovskites and 2D Ruddlesden-Popper perovskites as efficient and stable photoactive layers is also outlined. The syntheses, functions and working mechanisms of relevant 2D materials are introduced, and the challenges to achieving practical applications of HPODs using 2D materials are also discussed.

Photonics and Optoelectronics of 2D Metal‐Halide Perovskites

“…The large and well‐defined surfaces of 2D materials endow strong surface interaction with adjacent materials, which is better suited for assembly into heterosturctures. Recent investigations on heterostructures composed of 2D perovskites and conventional 2D material crystals have attracted considerable interest . Because of the large number of 2D crystals (including graphene, TMDs, metal nanosheets, etc.…”

Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration

“…[9,10] Colloidal NCs are considered as perfect pieces of their bulk counterparts since they are normally free of non-equilibrium crystal defects. [15,16] Since NCs with different growth modes normally show different physical and chemical properties, detailed investigations on NCs growth processes may help better understand the phase transformation and the underlying growth mechanisms. [15,16] Since NCs with different growth modes normally show different physical and chemical properties, detailed investigations on NCs growth processes may help better understand the phase transformation and the underlying growth mechanisms.…”

Emergence of Nanoplatelet Light-Emitting Diodes

“…For 2D all-inorganic perovskite NPLs, Bekenstein et al first reported CsPbX 3 NPLs showing the 1–5 unit cells thickness in 2015 [141]. Since then, many efforts have been focused on synthesizing precisely tunable as well as uniform CsPbX 3 NPLs [142,143,144,145]. Currently, colloidal NPLs of perovskite metal halides have been found to be a significant family of materials for LEDs, which enriches the diversity of semiconducting nanomaterials and provide a platform for exploring new optoelectronic properties of 2D semiconducting materials.…”