Recent Advances and Opportunities of Eco‐Friendly Ternary Copper Halides: A New Superstar in Optoelectronic Applications

Abstract

Recently, the newly‐emerging lead‐free metal‐halide materials with less toxicity and superior optoelectronic properties have received wide attention as the safer and potentially more robust alternatives to lead‐based perovskite counterparts. Among them, ternary copper halides (TCHs) have become a vital group due to their unique features, including abundant structural diversity, ease of synthesis, unprecedented optoelectronic properties, high abundance, and low cost. Although the recent efforts in this field have made certain progresses, some scientific and technological issues still remain unresolved. Herein, a comprehensive and up‐to‐date overview of recent progress on the fundamental characteristics of TCH materials and their versatile applications is presented, which contains topics such as: i) crystal and electronic structure features and synthesis strategies; ii) mechanisms of self‐trapped excitons, luminescence regulation, and environmental stability; and iii) their burgeoning optoelectronic devices of phosphor‐converted white light‐emitting diodes (WLEDs), electroluminescent LEDs, anti‐counterfeiting, X‐ray scintillators, photodetectors, sensors, and memristors. Finally, the current challenges together with future perspectives on the development of TCH materials and applications are also critically described, which is considered to be critical for accelerating the commercialization of these rapidly evolving technologies.

Structural, electronic, optical, elastic, thermodynamic and thermal transport properties of Cs2AgInCl6 and Cs2AgSbCl6 double perovskite semiconductors using a first-principles study

“…These studies have demonstrated the crucial role that this compound's distinctive structural and electronic characteristics play. [21][22][23][24][25][26] Notably, the perovskite structure exhibits a remarkable degree of symmetry, which contributes significantly to its photovoltaic applications. Furthermore, the defect-tolerant nature of CH 3 NH 3 PbI 3 further enhances its photovoltaic performance.…”

Unraveling the Origin of an Unusual Shift in the Electroluminescence of 1D CsCu2I3 Light-Emitting Diodes

“…Recently, low-dimensional metal halides have generated significant research interest in many optoelectronic applications due to their desirable photophysical properties. Among these, copper metal halides have emerged as a vital group due to their nontoxic nature and excellent optoelectronic properties, including simple synthesis and processing methods. − Cu­(I)-based metal halides have been investigated in photodetectors, X-ray scintillators, image sensors, temperature sensors, memristors and neuromorphic computing, fluorescent inks, anticounterfeiting, and encryption applications. , Cu exhibits multiple coordination numbers, which can form 2D layers, 1D chains, and isolated 0D units . Additionally, the Cu­(I) metal halides have a wide range of structural tunability; depending on the composition of ACuX (A: Cs, Rb, K, and X: Cl, Br, I), they form different crystal phases. − Each structure exhibits distinctive physical, chemical, and electronic properties.…”

Stability Optimization of 0D Cs3Cu2Cl5 Single Crystal with High Green Emission for Optoelectronics

“…These properties are significant in the field of optoelectronics, thereby rendering 0D lead-free metal halide perovskites the most promising next generation lighting materials. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] Cs 3 Cu 2 Cl 5 is widely used in photoelectric applications, including light-emitting devices (LEDs), [24] X-ray detection, [25] sensors, [26] high-resolution X-ray imaging, [27,28] and light communications. [29] Despite being a novel photoelectric material, Cs 3 Cu 2 Cl 5 has received limited attention compared with Cs 3 Cu 2 I 5 , because of the challenges in 1) obtaining large bulk single crystals and 2) its instability in the atmosphere.…”