The DOI matches its Crossref record; 23 of the 23 references it cites were found in a registry or an index.
Steric-Hindrance-Driven Shape Transition in PbS Quantum Dots: Understanding Size-Dependent Stability
Abstract
Ambient stability of colloidal nanocrystal quantum dots (QDs) is imperative for low-cost, high-efficiency QD photovoltaics. We synthesized air-stable, ultrasmall PbS QDs with diameter (D) down to 1.5 nm, and found an abrupt transition at D ≈ 4 nm in the air stability as the QD size was varied from 1.5 to 7.5 nm. X-ray photoemission spectroscopy measurements and density functional theory calculations reveal that the stability transition is closely associated with the shape transition of oleate-capped QDs from octahedron to cuboctahedron, driven by steric hindrance and thus size-dependent surface energy of oleate-passivated Pb-rich QD facets. This microscopic understanding of the surface chemistry on ultrasmall QDs, up to a few nanometers, should be very useful for precisely and accurately controlling physicochemical properties of colloidal QDs such as doping polarity, carrier mobility, air stability, and hot-carrier dynamics for solar cell applications.
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Metadata
- Authors
- Choi, H., Ko, J.-H., Kim, Y.-H., & Jeong, S.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-03-27
- Volume
- 135
- Issue
- 14
- Pages
- 5278-5281
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2332387166
- Cited by
- 403
- References
- 23
- FWCI
- 11.25
- Type
- journal article
- Language
- en
- Open access
- closed
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