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Temperature dependence of excitonic radiative decay in CdSe quantum dots: the role of surface hole traps.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Califano, Marco Franceschetti, A. Zunger, Alex |
| Copyright Year | 2005 |
| Abstract | Using atomistic, semiempirical pseudopotential calculations, we show that if one assumes the simplest form of a surface state in a CdSe nanocrystal--an unpassivated surface anion site--one can explain theoretically several puzzling aspects regarding the observed temperature dependence of the radiative decay of excitons. In particular, our calculations show that the presence of surface states leads to a mixing of the dark and bright exciton states, resulting in a decrease of 3 orders of magnitude of the dark-exciton radiative lifetime. This result explains the persistence of the zero-phonon emission line at low temperature, for which thermal population of higher-energy bright-exciton states is negligible. Thus, we suggest that surface states are the controlling factor of dark-exciton radiative recombination in currently synthesized colloidal CdSe nanocrystals. |
| Starting Page | 43 |
| Ending Page | 45 |
| Page Count | 3 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.colorado.edu/zunger-materials-by-design/sites/default/files/attached-files/501.pdf |
| PubMed reference number | 16351178v1 |
| Volume Number | 5 |
| Issue Number | 12 |
| Journal | Nano letters |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Anions Arabic numeral 0 Cold Temperature Dependence Nanocrystalline Materials Phonons Quantum Dots orders - HL7PublishingDomain |
| Content Type | Text |
| Resource Type | Article |
