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Tuning the optical and electronic properties of colloidal nanocrystals by lattice strain
Open accessAbstract
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).
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Dabbousi, B. O., Rodriguez-Viejo, J., Mikulec, F. V., Heine, J. R., Mattoussi, H., Ober, R., Jensen, K. F., & Bawendi, M. G. (1997) · The Journal of Physical Chemistry B · doi:10.1021/jp971091y · Cited by 4,229
Hell, S. W. (2007) · Science · doi:10.1126/science.1137395 · Cited by 2,967
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Metadata
- Authors
- Smith, A. M., Mohs, A. M., & Nie, S.
- Venue
- Nature Nanotechnology
- Published
- 2008-12-07
- Volume
- 4
- Issue
- 1
- Pages
- 56-63
- ISSN
- 1748-3387 (ISSN-L)
- 1748-3395
- OpenAlex
- W2075483486
- Cited by
- 809
- References
- 2
- FWCI
- 18.19
- Type
- journal article
- Language
- en
- Open access
- green
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