Controlled synthesis of Eu2+ and Eu3+ doped ZnS quantum dots and their photovoltaic and magnetic properties
| Autor: | Baichhabi Yakami, Jinke Tang, Sabit Horoz, Uma Poudyal, Wenyong Wang, Jon M. Pikal |
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| Přispěvatelé: | Belirlenecek |
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Photoluminescence Materials science business.industry Doping General Physics and Astronomy Phosphor 02 engineering and technology Photovoltaic effect 021001 nanoscience & nanotechnology 01 natural sciences lcsh:QC1-999 law.invention Paramagnetism Solar cell efficiency law Quantum dot 0103 physical sciences Solar cell Optoelectronics 0210 nano-technology business lcsh:Physics |
| Zdroj: | AIP Advances, Vol 6, Iss 4, Pp 045119-045119-7 (2016) |
| ISSN: | 2158-3226 |
| DOI: | 10.1063/1.4948510 |
| Popis: | Eu-doped ZnS quantum dots (QDs) have been synthesized by wet-chemical method and found to form in zinc blende (cubic) structure. Both Eu2+ and Eu3+doped ZnS can be controllably synthesized. The Eu2+ doped ZnS QDs show broad photoluminescence emission peak around 512 nm, which is from the Eu2+ intra-ion transition of 4f6d1 – 4f7, while the Eu3+ doped samples exhibit narrow emission lines characteristic of transitions between the 4f levels. The investigation of the magnetic properties shows that the Eu3+ doped samples exhibit signs of ferromagnetism, on the other hand, Eu2+ doped samples are paramagnetic of Curie-Weiss type. The incident photon to electron conversion efficiency is increased with the Eu doping, which suggests the QD solar cell efficiency can be enhanced by Eu doping due to widened absorption windows. This is an attractive approach to utilize benign and environmentally friendly wide band gap ZnS QDs in solar cells. This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-FG02-10ER46728. |
| Databáze: | OpenAIRE |
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