Abstract
We have succeeded in observing the size dependent photoluminescence (PL) from Ge nanocrystals (nc-Ge) with 0.9–5.3 nm in average diameter in the near-infrared region. The nc-Ge were fabricated by rf cosputtering of Ge and and post annealing at It was found that the sample with shows a PL peak at about 0.88 eV. With decreasing the size, the PL peak shifted to higher energies and reached 1.54 eV for the sample with It was also found that the PL intensity increases drastically with decreasing the size. The observed strong size dependence of the PL spectra indicates that the observed PL originates from the recombination of electron-hole pairs confined in nc-Ge.
- Received 22 January 1998
DOI:https://doi.org/10.1103/PhysRevB.58.7921
©1998 American Physical Society