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Influence of phosphorus on the growth and the photoluminescence properties of Si-NCs formed in P-doped SiO/SiO2 multilayersстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Trad F., Giba A.E., Devaux X., Stoffel M., Zhigunov D., Bouché A., Geiskopf S., Demoulin R., Pareige P., Talbot E., Vergnat M., Rinnert H.
- Журнал: Nanoscale
- Том: 13
- Год издания: 2021
- Издательство: RSC Pub.
- Местоположение издательства: Cambridge, England
- Первая страница: 19617
- DOI: 10.1039/d1nr04765e
- Аннотация: This work reports on the influence of phosphorous atoms on the phase separation process and opticalproperties of silicon nanocrystals (Si-NCs) embedded in phosphorus doped SiO/SiO2 multilayers. DopedSiO/SiO2 multilayers with different P contents have been prepared by co-evaporation and subsequentlyannealed at different temperatures up to 1100 °C. The sample structure and the localization of P atoms were both studied at the nanoscale by scanning transmission electron microscopy and atom probe tomography. It is found that P incorporation modifies the mechanism of Si-NC growth by promoting thephase separation during the post-growth-annealing step, leading to nanocrystal formation at lowerannealing temperatures as compared to undoped Si-NCs. Hence, the maximum of Si-NC related photoluminescence (PL) intensity is achieved for annealing temperatures lower than 900 °C. It is also demonstrated that the Si-NCs mean size increases in the presence of P, which is accompanied by a redshift of the Si-NC related emission. The influence of the phosphorus content on the PL properties is studied using both room temperature and low temperature measurements. It is shown that for a P content lower than about 0.1 at%, P atoms contribute to significantly improve the PL intensity. This effect is attributed to the P-induced-reduction of the number of non-radiative defects at the interface between Si-NCs and SiO2 matrix, which is discussed in comparison with hydrogen passivation of Si-NCs. In contrast, for increasing P contents, the PL intensity strongly decreases, which is explained by the growth of Si-NCs reaching sizes that are too large to ensure quantum confinement and to the localization of P atoms inside Si-NCs.
- Добавил в систему: Жигунов Денис Михайлович