- Self-trapped exciton state in Si nanocrystals revealed by induced absorption
- Physical Review B
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- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
Van 't Hoff Institute for Molecular Sciences (HIMS)
We report results of time-resolved induced absorption (IA) spectroscopy on Si nanocrystals (Si NCs) embedded in a SiO2 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.
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