期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 6, 期 13, 页码 2444-2448出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.5b00498
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- Israel Council for High Education - Focal Area Technology [872967]
- Volkswagen Stiftung [88116]
- Niedersachsen-Deutsche Technion Gesellschaft E.V [ZN2916]
Lead chalcogenide colloidal quantum dots are attractive candidates for applications operating in the near infrared spectral range. However, their function is forestalled by limited stability under ambient conditions. Prolonged temperature-activated cation-exchange of Cd2+ for Pb2+ forms PbSe/CdSe core/shell heterostructures, unveiling a promising surface passivation route and a method to modify the dots' electronic properties. Here, we follow early stages of an-exchange process, using spectroscopic and structural characterization tools, as well as numerical calculations. We illustrate that preliminary-exchange stages involve the formation of nonconcentric heterostructures, presumably due to a facet selective reaction, showing a pronounced change in the optical properties upon the increase of the degree of nonconcentricity or/and plausible creation of core/shell interfacial alloying. However, progressive-exchange stages lead to rearrangement of the shell segment into uniform coverage, providing tolerance to oxygen exposure with a spectral steadiness already on the formation of a monolayer shell.
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