| EPSRC Reference: |
GR/S49407/01 |
| Title: |
Next Generation GaN-based Materials |
| Principal Investigator: |
Dawson, Professor P |
| Other Investigators: |
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| Project Partners: |
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| Department: |
Physics and Astronomy |
| Organisation: |
University of Manchester, The |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 October 2003 |
Ends: |
30 September 2006 |
Value (£): |
223,953
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
Materials Processing |
| Materials Synthesis & Growth |
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Summary on Grant Application Form |
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The proposed research aims to understand the basic science behind the growth of high quality, low dislocation density, GaN based materials, and behind their complex optical properties. We will seek to understand the world record 46% internal quantum efficiency we have recently achieved for InGaN MQWs with 19% In content and extend this high efficiency to other compositions. We will study in detail the localisation of carriers in InGaN, AGaN and InAIGaN MQWs due to quantum well width fluctuations and compositional fluctuations. We propose to use Epitaxial Lateral Overgrowth (ELO) to grow low dislocation density GaN. We will grow GaN on Si using an AIN buffer layer and we will attempt to grow GaN on Si using a magic buffer layer. Our materials will be carefully characterised: structurally, optically and electrically. High resolution EELS will be used for an in-depth study of defect states in the band gap, and electron holography will be used to measure the piezoelectric fields across quantum wells. We will fabricate high efficiency green, blue and UV MQWs. We will develop the techniques of electron holography in a TEM and energy-filtered imaging in an SEM to measure quantitative 2-D dopant distributions in GaN-based structures with high spatial resolution.
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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.man.ac.uk |