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Details of Grant 

EPSRC Reference: GR/L70011/01
Title: INSB QUANTUM DOTS FOR MID-INFRARED APPLICATIONS
Principal Investigator: Booker, Dr GR
Other Investigators:
Klipstein, Dr P Nicholas, Professor RJ Wilshaw, Professor P
Researcher Co-Investigators:
Project Partners:
Department: Materials
Organisation: University of Oxford
Scheme: Standard Research (Pre-FEC)
Starts: 16 March 1998 Ends: 15 March 2000 Value (£): 131,992
EPSRC Research Topic Classifications:
Materials Characterisation
EPSRC Industrial Sector Classifications:
Electronics
Related Grants:
Panel History:  
Summary on Grant Application Form
Self-assembled strained arrays of InSb quantum dots (QDs) will be grown in InAs and GaSb matrices by the Stranski-Krastanow method using MOVPE with in-situ surface optical monitoring. For each material system, specimens with progressively increasing monolayer coverage will be grown under different conditions, e.g. substrate temperature, rate and V-III ratio. The size, shape, number density, distribution, composition and strain of the QDs, and the occurrence of associated defects. e.g. dislocations will be determined by a combination of TEM, HRTEM, AFM and Raman spectroscopy. The optical properties will be determined by PL. The electrical properties will be assessed by transport and tunneling measurements and the band structures and energy levels deducted. The aim is to control and understand the growth processes involved, to relate the structures to the optical and electrical properties, and to optimise the conditions to give the best materials suitable for novel devices, e.g. LEDs and lasers, to operate in the important mid-infrared wavelength range. Although there is at present intense activity worldwide with III-V QD materials and devices, no QD work has yet been reported for either the InSb/InAs and InSb/GaSb systems or the mid-IR range. The work will be performed by an experienced RA, Dr A G Norman who will grow the QDs in the Physics Department, Oxford, and perform the TEM, HRTEM, and AFM studies in the Materials Department, Oxford. This is a new project and not part of our present EPSRC project (GR/76962) which is concerned with antimony-based quantum well (QW) specimens.
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Organisation Website: http://www.ox.ac.uk