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Light emission from nanocrystalline silicon clusters embedded in silicon dioxide: Role of the suboxide states |
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| Authors: | Andriy Romanyuk Viktor Melnik Yaroslav Olikh Johannes Biskupek Ute Kaiser Martin Feneberg Klaus Thonke Peter Oelhafen |
| Institution: | aDepartment of Physics, University of Basel, 4056 Basel, Switzerland;bInstitute of Semiconductor Physics, 03028 Kyiv, Ukraine;cElectron Microscopy Group of Materials Science, University of Ulm, 89069 Ulm, Germany;dInstitute of Semiconductor Physics, University of Ulm, 89081 Ulm, Germany |
| Abstract: | Silicon clusters embedded in a silicon dioxide matrix were prepared by ultrasound-assisted implantation resulting in a modified concentration of suboxide states as revealed by high-resolution photoelectron spectroscopy. It is suggested that ultrasound treatment results in formation of different interface structure between silicon cluster and silicon dioxide matrix which is characterized by a distinctly reduced concentration of the suboxide states. It is observed that photoluminescence properties are strongly correlated with the concentration of the suboxide states thereby providing an evidence that besides a quantum confinement effect a closer look at the chemical composition of the nc-Si/SiO2 system is important. |
| Keywords: | Silicon nanoclusters Photoluminescence Cluster– matrix interface Ultrasound |
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