A-Site-Mediated Lattice Strain and Phase Control for Spectrally Tunable and High-Quality Quasi-Two-Dimensional Blue Perovskite Films

The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Language: Английский

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Screw-Dislocation-Driven Growth of 2D Perovskite Spiral Microplates

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 14, 2025

Two-dimensional (2D) organic-inorganic halide perovskites are solution-processable semiconductors that promising for optoelectronic applications. Understanding crystallization mechanisms to achieve control over nanostructures is important optimizing desired properties. Here we introduce a versatile strategy synthesize spiral microplates of diverse 2D at the air-water interface through screw-dislocation-driven growth. Spirals 11 perovskite compositions (LA)2(A)n-1PbnX3n+1 with different spacer (LA) cations, A-cations, (X) anions, and n-number can be grown. They typically consist single- or few-layer step heights but exhibit stacking complexity when multiple dislocations interact. The characteristic optical properties (photoluminescence second-harmonic generation) underlying perovskites. Fluorescence-detected circular dichroism imaging shows chirality center does not translate observed chiroptical microplate, consistent length scale chiral distortion. This solution growth spirals diversifies microstructures optoelectronics other

Language: Английский

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Optimizing Excited Charge Dynamics in Layered Halide Perovskites through Compositional Engineering

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: March 19, 2025

Dion-Jacobson phase multilayered halide perovskites (MLHPs) improve carrier transport and optoelectronic performance thanks to their shorter interlayer distance, long lifetimes, minimized nonradiative losses. However, limited atomistic insights into dynamic structure-property relationships hinder rational design efforts further boost performance. Here, we employ nonadiabatic molecular dynamics, time-domain density functional theory, unsupervised machine learning uncover the impact of A-cation mixing on controlling excited dynamics recombination processes in MLHPs. Mixing smaller-sized Cs with methylammonium MLHP weakens electron-phonon interactions, suppresses losses, slows down intraband hot electron relaxations. On contrary, larger-sized guanidinium incorporation accelerates The mutual information analyses reveal importance distances, intra- interoctahedral angle motion extending lifetime by mitigating losses Our work provides a guideline for strategically choosing A-cations layered perovskites.

Language: Английский

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Enhanced Photoluminescence of Cesium Cadmium Chloride via Cu Doping for X-ray Detection and Anticounterfeiting Applications

ACS Applied Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 28, 2025

Language: Английский

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