21:T552,The growth of large semiconductor crystals is crucial for advancing modern electronics and optoelectronics. While various crystal growth techniques have been developed for lead halide perovskites, a significant challenge remains: as crystal size increases, performance tends to deteriorate dramatically. This study addresses the inherent limitations of perovskite crystal growth by designing a novel strategy for near-equilibrium growth system to maintain optimal conditions throughout the process. The system consists of three independent units: a solution supply unit, a crystal growth unit, and a solution recycling unit, which together ensure a constant solution concentration and temperature. By systematically optimizing temperature control and solution feeding rates, large and high-quality FAPbBr₃ single crystals, including a notable crystal measuring 51 × 45 × 10 mm³ are successfully produced. This crystal demonstrates a mobility-lifetime product of 2.83 × 10⁻² cm² V⁻¹ and an ultralow detection limit of 319.22 pGy_air, significantly surpassing existing perovskite crystals of similar size. The approach can serve as a universal platform for the controlled synthesis of all kinds of perovskite single crystals, laying the foundations for their use in various optoelectronic applications.22:T550,Accumulation of heavy metal ions, including copper ions (Cu²⁺), presents a serious threat to human health and to the environment. A substantial amount of research has focused on detecting such species in aqueous solutions. However, progress towards ultrasensitive and easy-to-use sensors for non-aqueous solutions is still limited. Here, we focus on the detection of copper species in hexane, realising ultra-sensitive detection through a fluorescence-based approach. To achieve this, a novel macroporous composite material has been developed featuring luminescent CsPbBr₃ nanocrystals (NCs) chemically adhered to a polymerized high internal phase emulsion (polyHIPE) substrate through surface thiol groups. Due to this thiol functionality, sub-monolayer NC formation is realised, which also renders outstanding stability of the composite in the ambient environment. Copper detection is achieved through a direct solution based immersion of the CsPbBr₃-(SH)polyHIPE composite, which results in concentration-dependent quenching of the NC photoluminescence. This newly developed sensor has a limit of detection (LOD) for copper as low as 1 × 10^-16 M, and a wide operating window spanning 10^-2 to 10^-16 M. Moreover, the composite exhibits excellent selectivity among different transition metals.

	Year	Citations

About