Optical properties of CdTe/ZnTe self-assembled quantum dots: Raman and photoluminescence spectroscopy
| Autor: | M. Gilić, R. Kostić, Jelena Trajic, Witold Dobrowolski, D. Stojanović, G. Karczewski, Nebojša Romčević, R. Galazka, Maja Romcevic |
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| Rok vydání: | 2013 |
| Předmět: |
Photoluminescence
Materials science Phonon 02 engineering and technology 7. Clean energy 01 natural sciences Molecular physics law.invention Condensed Matter::Materials Science symbols.namesake law 0103 physical sciences Materials Chemistry Spectroscopy 010302 applied physics business.industry Mechanical Engineering Metals and Alloys Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Laser Cadmium telluride photovoltaics Mechanics of Materials Quantum dot symbols Optoelectronics 0210 nano-technology business Ground state Raman spectroscopy |
| Zdroj: | Journal of Alloys and Compounds. 579:330-335 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2013.06.081 |
| Popis: | The properties of 3 monolayers (ml) CdTe self-assembled quantum dot (SAQD) sample are investigated by means of Raman and photoluminescence (PL) spectroscopy. The PL spectrum is characterized by two main emission peaks, both connected with the existence of QDs. One presents direct deexcitation to ground state and the other one is optical phonon ( ω = 204.2 cm −1 ) assisted deexcitation. One-phonon Raman spectra at room temperature show surface-optical phonon at 201 cm −1 . At temperatures below 200 K, multiphonon processes are registered. Multiphonon maximum depends on the temperature, and laser energy. |
| Databáze: | OpenAIRE |
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