Unravelling the impurity location and binding in heavily doped semiconductor nanocrystals; the case of Cu in InAs nanocrystals
| Autor: | Hagai Eshet, Uri Banin, Eran Rabani, Adam Faust, Anatoly I. Frenkel, Yorai Amit, Anitha Patllola |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Dopant Condensed matter physics Doping 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials X-ray absorption fine structure Condensed Matter::Materials Science General Energy Nanocrystal Impurity Quantum dot Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Density functional theory Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy |
| Zdroj: | The Journal of Physical Chemistry C |
| ISSN: | 1932-7447 |
| DOI: | 10.1021/jp4032749 |
| Popis: | The doping of colloidal semiconductor nanocrystals (NCs) presents an additional knob beyond size and shape for controlling the electronic properties. An important problem for doping with aliovalent elements is associated with resolving the location of the dopant and its structural surrounding within small NCs, an issue directly connected with self-purification. Here we used a postsynthesis diffusion-based doping method for introducing Cu impurities into InAs quantum dots. X-ray absorption fine structure (XAFS) spectroscopy experiments along with first-principle density functional theory (DFT) calculations were used to probe the impurity sites. The concentration dependence was investigated for a wide range of doping levels, helping to derive a self-consistent picture where the Cu impurity occupies an interstitial site within the InAs lattice. Moreover, at extremely high doping levels, Cu–Cu interactions are identified in the XAFS data. This structural model is supported by X-ray diffraction data, along wit... |
| Databáze: | OpenAIRE |
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