Self-trapped exciton state in Si nanocrystals revealed by induced absorption

Publication Type:
Journal Article
Physical Review B - Condensed Matter and Materials Physics, 2012, 85 (16)
Issue Date:
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We report results of time-resolved induced absorption (IA) spectroscopy on Si nanocrystals (Si NCs) embedded in a SiO 2 matrix. In line with theoretical modeling, the IA amplitude decreases with probing photon energy, however only until a certain threshold value. For larger photon energies, an increase of IA is observed. This unexpected behavior is interpreted in terms of the self-trapped exciton state whose formation in Si NCs was put forward some time ago based on theoretical considerations. Here, we present a direct experimental confirmation of this supposition. © 2012 American Physical Society.
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