Publication date: 17th July 2025
Heterostructured nanocrystals (NCs), such as core-shell architectures, are often designed and synthesized under kinetically controlled conditions. However, in any realistic application, be it in optoelectronics, catalysis, or energy conversion, these NCs will inevitably be exposed to thermal or other energetic inputs. Understanding how they structurally evolve in response to such stimuli is, therefore, not only scientifically relevant but essential for predicting and engineering functional performance.
In this talk, we explore the temperature-driven transformations of NCs, both in solution and in the solid state, with a particular focus on heterostructured systems. Using a model metal-semiconductor core-shell system, we dissect how initial configurations, often kinetically trapped, undergo reorganization toward more stable, thermodynamically favored states. We discuss the mechanistic pathways that govern these transformations, highlight the key parameters influencing interfacial diffusion (such as bonding strength, lattice mismatch, and defect densities), and demonstrate how these can be tuned to direct the final NC architecture.
By bridging synthesis, in situ observation, and theory, we aim to provide a framework for understanding and controlling structural evolution in NC heterostructures under operational conditions.
ISTA and the Werner Siemens Foundation financially supported this work.
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