Publication date: 15th December 2025
Metal-halide perovskites have emerged as a versatile family of materials for both light-harvesting and light-emission applications. Their hybrid organic–inorganic soft lattices give rise to complex electron–lattice interactions that strongly influence charge transport and recombination. Among these interactions, the formation of self-trapped electronic states—driven by strong electron–phonon coupling and local lattice distortions—plays a critical yet not fully understood role in governing the optoelectronic behavior of many perovskite systems.
In this talk, I will introduce our recent efforts to understand and manipulate self-trapped states across perovskites with dimensionalities ranging from 0D to 3D. By integrating temperature-dependent photoluminescence, transient absorption spectroscopy, optical-pump–THz-probe measurements, and DFT calculations, we reveal that charge carriers in the double perovskite Cs₂AgBiBr₆ are rapidly localized by lattice distortion within ~4 ps, causing a ~70% drop in photoconductivity and fundamentally limiting its photovoltaic potential. We further show that dynamic self-trapped excitons may underlie the unusually high energy gain observed in fluorescence upconversion in the 2D perovskite (PEA)₂PbI₄. Additionally, we demonstrate that the emission energy of a zero-dimensional perovskite, (TBA)Sb₂Cl₇, can be effectively tuned by controlling structural disorder in its glassy phase.
Together, these results highlight the pivotal role of electron–lattice interactions in determining the optoelectronic properties of metal-halide perovskites and point toward new design principles for next-generation halide materials.
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