GaAsSb/GaAsN short-period superlattices as a capping layer for improved InAs quantum dot-based optoelectronics

Journal Article · Mon Jul 28 04:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4891557· OSTI ID:22311217

Utrilla, A. D.; Guzman, A.; Hierro, A. ^[1]; Reyes, D. F.; González, D.; Ben, T. ^[2]

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1. Institute for Systems based on Optoelectronics and Microtechnology (ISOM) and Departamento de Ingeniería Electrónica, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid (Spain)
2. Departamento de Ciencia de los Materiales e IM y QI, Universidad de Cádiz, 11510 Puerto Real (Cádiz) (Spain)

The application of a GaAsSb/GaAsN short-period superlattice capping layer (CL) on InAs/GaAs quantum dots (QDs) is shown to be an option for providing improved luminescence properties to this system. Separating both GaAsSb and GaAsN ternaries during the growth in 2 monolayer-thick phases solves the GaAsSbN immiscibility-related problems. Strong fluctuations in the CL composition and strain field as well as in the QD size distribution are significantly reduced, and a more regular CL interface is also obtained. Room-temperature (RT) photoluminescence (PL) is obtained for overall N contents as high as 3%, yielding PL peak wavelengths beyond 1.4 μm in samples with a type-II band alignment. High external quantum efficiency electroluminescence and photocurrent from the QD ground state are also demonstrated at RT in a single QD-layer p-i-n device. Thus, it becomes possible to combine and transfer the complementary benefits of Sb- and N-containing GaAs alloys to InAs QD-based optoelectronics.

• OSTI ID: 22311217
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 105; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIMONY COMPOUNDS
CRYSTAL GROWTH
ELECTRO-OPTICAL EFFECTS
ELECTROLUMINESCENCE
FLUCTUATIONS
GALLIUM ARSENIDES
GROUND STATES
INDIUM ARSENIDES
INTERFACES
LAYERS
NITROGEN COMPOUNDS
PHOTOLUMINESCENCE
QUANTUM DOTS
QUANTUM EFFICIENCY
STRAINS
SUPERLATTICES
TEMPERATURE RANGE 0273-0400 K
TERNARY ALLOY SYSTEMS