DOI: 10.1063/1.1537437. Ge hut cluster luminescence below bulk Ge band gap

Ge hut cluster luminescence below bulk Ge band gap

10.1063/1.1537437

Crossref journal-article

AIP Publishing

Applied Physics Letters (317)

Abstract

We report on the photoluminescence (PL) properties of Ge hut cluster islands on Si(001) that were overgrown at temperatures as low as 250 °C. We find that the island-related photoluminescence systematically redshifts as the overgrowth temperature is reduced from 500 to 360 °C, which is attributed to a reduced Ge segregation. For even lower overgrowth temperatures, the emission energy saturates at 0.63 eV or 1.96 μm, more than 110 meV smaller than the band gap of unstrained bulk Ge. We report a PL peak centered at 2.01 μm at low excitation power, in good agreement with the estimated transition energy for a spatially indirect transition between holes confined in the strained Ge island and electrons confined in the surrounding Si matrix. PL is observed up to a temperature of 185 K and an activation energy of 40 meV is deduced from fitting the temperature-dependent peak intensity. Annealing experiments reveal a systematic blueshift of the hut cluster-related PL, thus verifying unambiguously, that the PL signal originates from the hut clusters and not from defects.

Bibliography

Denker, U., Stoffel, M., Schmidt, O. G., & Sigg, H. (2003). Ge hut cluster luminescence below bulk Ge band gap. Applied Physics Letters, 82(3), 454â456.

Authors 4

U. Denker (first)
M. Stoffel (additional)
O. G. Schmidt (additional)
H. Sigg (additional)

References 26 Referenced 52

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{'key': '2024020323520506900_r9a', 'first-page': '247', 'volume': '69', 'year': '2000', 'journal-title': 'Mater. Sci. Eng., B'} / Mater. Sci. Eng., B (2000)
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Dates

Type	When
Created	22 years, 7 months ago (Jan. 16, 2003, 4:28 p.m.)
Deposited	1 year, 7 months ago (Feb. 3, 2024, 6:52 p.m.)
Indexed	1 year ago (Sept. 4, 2024, 5:42 a.m.)
Issued	22 years, 7 months ago (Jan. 20, 2003)
Published	22 years, 7 months ago (Jan. 20, 2003)
Published Print	22 years, 7 months ago (Jan. 20, 2003)

Funders 0

None

BibTeX

@article{Denker_2003, title={Ge hut cluster luminescence below bulk Ge band gap}, volume={82}, ISSN={1077-3118}, url={http://dx.doi.org/10.1063/1.1537437}, DOI={10.1063/1.1537437}, number={3}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Denker, U. and Stoffel, M. and Schmidt, O. G. and Sigg, H.}, year={2003}, month=jan, pages={454–456} }

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