2009
DOI: 10.1063/1.3224952
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Influence of surface chemistry on photoluminescence from deuterium-passivated silicon nanocrystals

Abstract: Stability of Se passivation layers on Si(001) surfaces characterized by time-of-flight positron annihilation inducedAuger electron spectroscopy

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Cited by 9 publications
(22 citation statements)
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“…The XPS and TPD data (Figures and ) indicate that N atoms are being inserted into the Si−Si bonds without an appreciable increase in deuterides. A similar result was observed in our earlier work with Si NCs passivated using atomic deuterium generated from D 2 on the hot tungsten filament; at extremely high atomic deuterium doses, the surface saturated with trideuteride species and the D 2 + area did not increase any further. Once the NC surface is covered with substantial amounts of trideuteride species, atomic D can attack the Si backbonds, resulting in the formation of an amorphous layer on the NC surface, and this amorphous layer was shown to quench the PL signal .…”
supporting
confidence: 89%
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“…The XPS and TPD data (Figures and ) indicate that N atoms are being inserted into the Si−Si bonds without an appreciable increase in deuterides. A similar result was observed in our earlier work with Si NCs passivated using atomic deuterium generated from D 2 on the hot tungsten filament; at extremely high atomic deuterium doses, the surface saturated with trideuteride species and the D 2 + area did not increase any further. Once the NC surface is covered with substantial amounts of trideuteride species, atomic D can attack the Si backbonds, resulting in the formation of an amorphous layer on the NC surface, and this amorphous layer was shown to quench the PL signal .…”
supporting
confidence: 89%
“…Reducing the HWCVD growth time reduces the particle size, and PL peak position should shift to a lower wavelength in accordance with quantum confinement. Such a quantum shift has been observed in our earlier work with deuterium-passivated particles . However, with the ND 3 -passivated NCs, no quantum shift is discernible.…”
supporting
confidence: 79%
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“…12(b) but it is shifted with respect to the bulk band gap (shown by dashed lines) and more importantly, the wavefunctions of the states at the anticipated top of the VB (and bottom of the CB) are localized at the QD surface rather than extending through the volume of the QD. Since surface passivation is known to be important both from the perspective of enhancing measured optical properties 62,63 and calculated positions of energies in VB and CB, 50,64 we have added an extra atomic layer to the clusters which we investigated, making sure that there remains no dangling bond of the QD core. The passivation layer atoms are assumed to have the same hopping to the QD core atoms as the core atoms between each other and to keep the model simple, we assign a single on-site energy E pass to their s-and porbitals.…”
Section: Appendix B: Tight-binding Model For Simple Cubic Face Centementioning
confidence: 99%
“…Alternative preparation methods produces NCs with different surface terminations (D, F, C, and others) that earned some interest in the last years. [14][15][16][17][18] Moreover, also the role of nitrogen has been recently explored 19 .…”
Section: Introductionmentioning
confidence: 99%