Publication date: 22nd July 2026
Lead-free halide perovskites have emerged as promising alternatives to conventional Pb-based materials, offering new opportunities to develop environmentally benign semiconductors while uncovering fundamentally different structure-property relationships. This presentation will highlight recent advances toward understanding and developing lead-free perovskites across both bulk and nanocrystalline material platforms.
The first portion of the talk will focus on two-dimensional germanium halide perovskites, where temperature-dependent optical spectroscopy, single-crystal structural characterization, and theoretical modeling reveal how lattice rigidity governs exciton-phonon interactions. Compared to analogous Pb-based materials, the Ge perovskites exhibit significantly weaker coupling to longitudinal optical phonons, suppressed bound-exciton formation, and the narrowest reported emission linewidths for a Ge-based halide perovskite, demonstrating that careful structural design can fundamentally alter excited-state dynamics.
Building on these insights, the presentation will discuss ongoing efforts to extend lead-free perovskite chemistry into colloidal nanocrystal systems through the synthesis of double perovskite nanomaterials. Preliminary studies highlight both the synthetic challenges and emerging opportunities associated with preparing compositionally complex lead-free nanocrystals with controlled optical properties. Together, these examples illustrate how fundamental understanding of lattice dynamics and continued advances in synthetic chemistry are expanding the landscape of lead-free halide perovskites for future optoelectronic applications.
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