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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 38, Iss. 18 — Sep. 15, 2013
  • pp: 3485–3487

Quantum-confined photoluminescence from Ge1−xSnx/Ge superlattices on Ge-buffered Si(001) substrates

Guo-En Chang, Wen-Yao Hsieh, Jia-Zhi Chen, and Henry H. Cheng  »View Author Affiliations


Optics Letters, Vol. 38, Issue 18, pp. 3485-3487 (2013)
http://dx.doi.org/10.1364/OL.38.003485


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Abstract

We report the first observation of room-temperature quantum-confined photoluminescence (PL) from low-dimensional Ge1xSnx/Ge superlattices (SLs) up to a high Sn content of 6.96%. Both direct and indirect emissions associated with the interband transitions between minibands in the conduction bands and valence band were observed at room temperature. As the Sn content is increased, the energy difference between the lowest direct and indirect transitions is reduced, indicating an effective modification of the band structure desired for optoelectronics. The integrated PL intensity ratio of direct to indirect recombinations is significantly enhanced with increasing Sn content due to the reduced Γ-L energy separation and quantum confinement effect. Those results suggest that Sn-based low-dimensional structures are promising material for efficient Si-based lasers.

© 2013 Optical Society of America

OCIS Codes
(160.3380) Materials : Laser materials
(250.3140) Optoelectronics : Integrated optoelectronic circuits
(250.5230) Optoelectronics : Photoluminescence
(250.5300) Optoelectronics : Photonic integrated circuits

ToC Category:
Optoelectronics

History
Original Manuscript: July 22, 2013
Manuscript Accepted: August 4, 2013
Published: September 4, 2013

Citation
Guo-En Chang, Wen-Yao Hsieh, Jia-Zhi Chen, and Henry H. Cheng, "Quantum-confined photoluminescence from Ge1−xSnx/Ge superlattices on Ge-buffered Si(001) substrates," Opt. Lett. 38, 3485-3487 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-18-3485


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