Diffusivity transients and radiative recombination in intermixed In{sub 0.5}Ga{sub 0.5}As/GaAs quantum structures

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.R4336· OSTI ID:538555

Leon, R ^[1]; Williams, D R ^[2]; Krueger, J; Weber, E R ^[3]; Melloch, M R ^[4]

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1. Department of Electronic Materials Engineering, Research School of Physical Sciences, Australian National University, Institute of Advanced Studies, Canberra, Australian Capital Territory 0200 (Australia)
2. Department of Applied Mathematics, Research School of Physical Sciences, Australian National University, Institute of Advanced Studies, Canberra, Australian Capital Territory 0200 (Australia)
3. Materials Science Division, Ernest Orlando Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
4. School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907-1285 (United States)

The effects of thermally induced compositional disordering on the luminescence from two-dimensional and zero-dimensional In{sub 0.5}Ga{sub 0.5}As/GaAs structures are examined. Quantum-mechanical numerical calculations modeling changes in the quantum-well (QW) confining potential with interdiffusion have been used to obtain values for diffusivities. These show transient behavior. Activation energies for interdiffusion (3.5{plus_minus}0.3 eV) are found to be similar to values reported for low-indium-content In{sub x}Ga{sub 1{minus}x}As/GaAs QW{close_quote}s. In quantum-dot structures, larger blueshifts can be obtained than in QW{close_quote}s under similar conditions. Interdiffusion decreased activation energies for radiative recombination, reflecting changes in confining potentials, and affecting lifetime ratios in recombination processes. The latter were observed in all intermixed heterostructures regardless of dimensionality. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 538555
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 8 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CARRIER LIFETIME
CHEMICAL COMPOSITION
DIFFUSION
GALLIUM ARSENIDES
HETEROJUNCTIONS
INDIUM ARSENIDES
INDIUM COMPOUNDS
LUMINESCENCE
RECOMBINATION
SURFACE POTENTIAL
TEMPERATURE DEPENDENCE
TRANSIENTS