Organic–inorganic metal halide hybrids beyond perovskites

Abstract

Organic-inorganic metal halide hybrids have emerged as new generation functional materials with exceptional structure and property tunability for a variety of applications. Besides the most investigated ABX 3 metal halide perovskites, a variety of hybrids consisting of a wide range of organic cations and metal halide anions have been developed and studied recently. Here, we provide an overview of these new materials possessing various crystallographic structures, including double perovskites, low dimensional hybrids, and other perovskite-related materials. We discuss their syntheses, functional properties, and optoelectronic applications. Challenges and opportunities are then laid out for these hybrid materials beyond perovskites. IMPACT STATEMENTBy choosing appropriate organic cations and metal halide anions, single crystalline ionically bonded hybrid materials can be assembled to possess various structures beyond the well-known ABX 3 perovskite. These hybrid materials exhibit exciting new properties with potential applications in a variety of areas. ARTICLE HISTORY

Colloidal Synthesis and Optical Properties of All‐Inorganic Low‐Dimensional Cesium Copper Halide Nanocrystals

“…[1] Thee xceptional structural tunability of such materials enables them to form various types of crystal structures,from three-dimensional (3D) networks to two-dimensional (2D) layers,o ne-dimensional (1D) chains,a nd ultimately zerodimensional (0D) isolated structures at the molecular level. [2] Although significant progress has been realized in the study of 3D and 2D metal halides, [3] 1D and 0D metal halides,w hich exhibit unique photophysical properties because of strong quantum confinement effects,h ave not been fully investigated to date. [2,4] Thelibrary of low-dimensional metal halides includes lead-based and lead-free compounds, [4a,5] and aseries of organic-inorganic hybrid 1D and 0D metal halides with highly efficient photoluminescence (PL) have recently been reported by Ma and co-workers.…”

“…[2] Although significant progress has been realized in the study of 3D and 2D metal halides, [3] 1D and 0D metal halides,w hich exhibit unique photophysical properties because of strong quantum confinement effects,h ave not been fully investigated to date. [2,4] Thelibrary of low-dimensional metal halides includes lead-based and lead-free compounds, [4a,5] and aseries of organic-inorganic hybrid 1D and 0D metal halides with highly efficient photoluminescence (PL) have recently been reported by Ma and co-workers. [6] In addition, all-inorganic low-dimensional nanomaterials based on 3D CsPbX 3 structures have exhibited relatively high photoluminescence quantum yields (PLQYs).…”

Thermoinduced structural-transformation and thermochromic luminescence in organic manganese chloride crystals

“…Metal (Mn,1 Mo,2 W,3 Pb,4 Sn,5 and Cu6) halides (Cl, Br, and I) represent an attractive class of molecular building blocks in luminescent functional materials, which demonstrate potential application in light-emitting diodes, luminescent solar concentrators, photovoltaic modules, etc. 7 Among them, organic manganese( ii ) halide hybrids frequently display strong luminescence originating from the d–d transition, with lifetimes from microseconds to milliseconds 1,8. The reported manganese halides focus on monomanganese species,1a,9 manganese chain structure1b,10 and layer structure,11 however the oligomeric cluster of manganese( ii ) remains quite limited,12 which deserved careful investigation due to the structural uniqueness.…”

Recent Progress in Engineering Metal Halide Perovskites for Efficient Visible‐Light‐Driven Photocatalysis

“…Considering the structural instability and intrinsic toxicity in 3 D lead‐based perovskites, extensive research has explored MHPs with other structures and compositions, such as lead‐free perovskites and low‐dimensional perovskites, such as AB 2 X 5 (see Figure d, also called 2 D perovskite), A 4 BX 6 (see Figure e, also called 0D perovskite), and double‐phase perovskites (A 2 B + B 3+ X 6 , see Figure f) . In particular, the lead‐free double‐phase Cs 2 AgBiBr 6 perovskite, showing a long photoluminescence (PL) lifetime (ca.…”