| EPSRC Reference: |
GR/M85098/01 |
| Title: |
THEORY OF GAINNAS MATERIALS AND OPTOELECTRONICS DEVICES |
| Principal Investigator: |
Adams, Professor A |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Sch of Electronics & Physical Sciences |
| Organisation: |
University of Surrey |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 April 2000 |
Ends: |
30 June 2003 |
Value (£): |
129,427
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
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| EPSRC Industrial Sector Classifications: |
| Electronics |
No relevance to Underpinning Sectors |
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Summary on Grant Application Form |
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GaInNAs exhibits a remarkable band-gap bowing, enabling optical emission at 1.3 and 1.5 microns on a GaAs substrate. We have developed thr first theory which explains qualitatively and quantitatively the origin of this strong bowing in bulk GaInNAs. The theory is based on and confirmed by tight-binding calculations we have performed. We will extend the theory to give a modified 8+N -band K.P Hamiltonian to determine confinement energies and subband dispersion in GaInNAs/GaAs quantum well structures. The model will be validated and refined by comparison with experimental data from collaborators and from the literature. Calculations will then be undertaken to investigate how the unique features of GaInNAs/GaAs quantum wells change laser gain characteristics compared to conventional GaInAsP/InP and AlGaInAs/InP Qwlasers. These unique features include an extremely large conduction band offset, comparable conduction and valence effective masses, and significantly reduced optical transition matrix elements, due to strong mixing with a N-related resonance level. We shall also investigate whether this mixing enhances the direct CHCC Auger recombination loss mechanism, by relaxing the normal momentum conservation requirements. Our modelling provides the first clear understanding of the electronic properties of GaInNAs materials, and will enable us to predict optimum GaInNAs quantum-well laser structures.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.surrey.ac.uk |