Real-Time Structural Dynamics at the 3D/2D Perovskite Interface in CsPbBr<sub>3</sub>/PEA<sub>2</sub>PbBr<sub>4</sub> Nano-heterostructures.
basic_science · Level V
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- Record sourced from PubMed, PMID 39691065.
- Also identified by DOI 10.1021/acs.nanolett.4c05021.
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Abstract
Three-dimensional (3D) and two-dimensional (2D) perovskite hybrid systems, known for their exceptional optoelectronic properties and stability, are revolutionizing optoelectronic materials research. However, fundamental physics of the 3D/2D interfaces and their dynamics remain poorly understood. We use fluorescence microspectroscopy to study the photoluminescence (PL) properties of 3D/2D nano-heterostructures of CsPbBr<sub>3</sub>/PEA<sub>2</sub>PbBr<sub>4</sub> formed by postgrowth self-assembly. The in situ PL spectra uncover the presence of new structural phases, quasi-2D PEA<sub>2</sub>Cs<sub><i>n</i>-1</sub>Pb<sub>n</sub>Br<sub>3<i>n</i>+1</sub> layers of varying <i>n</i>, at the 3D/2D interface and demonstrate their reversible restructuring under light excitation at room temperature. The restructuring is a result of layer-by-layer cation diffusion at the epitaxial interfaces, manifested as reversible spectral shifts occurring on a time scale of seconds. Such dynamics ultimately leads to optimized distribution of the quasi-2D phases in the system for efficient energy transfer from the 2D to the 3D phases. Our findings provide new insights into controlling energy flow in 3D/2D perovskites for next-generation optoelectronic devices.