- Mid-infrared spectroscopy of the Er-related donor state in Si/Si:Er3+ nanolayers
- Materials Science and Engineering B-Advanced Functional Solid-State Materials
- Volume | Issue number
- 146 | 1-3
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
We present experimental evidence on the donor level related to optical properties of the Er3+ ion in crystalline silicon. Using two-color spectroscopy with a free-electron laser we provide a direct link between the identified level in the bandgap and the optical properties of EP,. The investigation is performed in sublimation MBE-grown Si/Si:Er multinanolayer structure, which allows us to take advantage of the preferential formation of a single Er-related center. Quenching of the Er-related 1.5 mu m photoluminescence, due to ionization of the donor state with energy E-D approximate to 225 meV, is demonstrated. A microscopic model of the PL quenching mechanism as Auger type energy transfer between excited Er3+ ions and free carriers optically ionized from the Er-related donor states is put forward.
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