Tuning the Optical and Electronic Properties of Colloidal Nanocrystals by Lattice Strain
By Andrew M. Smith, Aaron M. Mohs, Shuming Nie. Nature Nanotechnology, 2008
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Lattice strain is a structural parameter that has been exploited in microelectronic devices with great success, but its role in colloidal nanocrystals is still poorly understood. Here we have developed strain-tunable colloidal nanocrystals by using lattice-mismatched heterostructures that are grown by epitaxial deposition of a compressive shell (e.g., ZnSe or CdS) onto a soft and small nanocrystalline core (e.g., CdTe). This combination of a “squeezed” core and a “stretched” shell causes dramatic changes in both the conduction and valence band energies. As a result, we show that core-shell QDs with standard type-I behavior are converted into type-II nanostructures, leading to spatial separation of electrons and holes, extended excited state lifetimes, and giant spectral shifting. This new class of strain-tunable QDs exhibits narrow light emission with high quantum yield across a broad range of visible and near-infrared wavelengths (500 nm to 1050 nm).
Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/6dca1f7959a4fa61e814489341cc0a3218f4f9d4
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Citations in the corpus
- X-ray scattering characterisation of nanoparticles (2015, background): “2 nm CdTe cores (Figure 5).[184] For ZnSe shells up to 9 ML thick, a systematic shift in the CdTe zincblende peak positions was observed that was consistent with compressive strain.”