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Projects: Projects for Investigator
Reference Number EP/Y00423X/1
Title Segregation of alloy and dopant atoms at defects in nitride materials
Status Started
Energy Categories Other Cross-Cutting Technologies or Research 5%;
Not Energy Related 95%;
Research Types Basic and strategic applied research 100%
Science and Technology Fields PHYSICAL SCIENCES AND MATHEMATICS (Chemistry) 40%;
PHYSICAL SCIENCES AND MATHEMATICS (Metallurgy and Materials) 20%;
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Professor DR Bowler

Physics and Astronomy
University College London
Award Type Standard
Funding Source EPSRC
Start Date 01 February 2024
End Date 31 January 2027
Duration 36 months
Total Grant Value £436,882
Industrial Sectors No relevance to Underpinning Sectors
Region London
Programme NC : Physical Sciences
Investigators Principal Investigator Professor DR Bowler , Physics and Astronomy, University College London (100.000%)
Web Site
Abstract Electronic and opto-electronic devices based on gallium nitride (GaN) form a multi-billion dollar industry across the world, including lighting (LEDs), power sources and communications (radar and 5G). One of the most challenging aspects of developing these devices commercially is the high density of defects - i.e. mistakes in the crystal's structure - found in most commercially grown GaN, such as dislocations and stacking faults. It is possible to grow GaN with fewer of these mistakes, but it is slow and expensive, and most devices therefore contain a high density of defects, which will affect device performance.In particular, all devices will contain either alloying elements (aluminium gallium nitride, AlGaN, and indium gallium nitride, InGaN, are made by alloying Al and In with Ga during growth) and/or doping elements (magnesium, Mg, is added to change the conduction properties of GaN, for instance for making LEDs) and these elements will interact with the defects, which can prevent the extra elements from having the intended impact or change the local properties of the material being grown in undesirable ways.We will study how alloying and doping elements interact with defects, in particular where larger or smaller numbers of these atoms are found relative to what is expected. We will seek to understand why these changes happen, and ultimately how they can be controlled, either to reduce the numbers of defects, or to reduce the harmful effects of the defects on the desired materials properties. Our project will link state-of-the-art experimental techniques with cutting edge theory and modelling approaches. The experimental data will allow us to examine the positions of individual atoms with exquisite detail, while the modelling will address problems which involve large numbers of atoms, something which standard approaches cannot manage. This combination of techniques will enable us to understand and control the materials in ways that are not possible with each technique independently, and which will feed into industrial processes
Publications (none)
Final Report (none)
Added to Database 18/10/23