Details of Grant 

EPSRC Reference:	GR/J50187/01
Title:	OPTICAL EMISSION FROM ION BEAMS SYNTHESISED (100) SI/B-FESI2/SI STRUCTURES AT 1.5 UM
Principal Investigator:	Homewood, Professor K
Other Investigators:	Kirkby, Dr K Sealy, Professor B Kirkby, Professor KJ
Researcher Co-Investigators:
Project Partners:
Department:	Sch of Electronics & Physical Sciences
Organisation:	University of Surrey
Scheme:	Standard Research (Pre-FEC)
Starts:	01 June 1994	Ends:	31 May 1996	Value (£):	85,801
EPSRC Research Topic Classifications:	Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:
Summary on Grant Application Form
(l) To establish and optimise the optical properties and quality of ion beam synthesised -FeSi2.(2) To determine the basic optoelectronic properties of energy gap and structure.(3) To investigate the effect of alloying with Co to tune the bandgap energy.(4) To produce a demonstrator electroluminescent optical source emitting at 1.5 -m.Progress:This project is progressing well. We have produced ion beam synthesised -FeSi2 that has sharp luminescence emitting at a wavelength of l.5 -m. We have demonstrated that hydrogenation can raise the threshold temperature of the luminescence from around l0K to close to room temperature.By performing detailed absorption measurements we have shown that the absorption edge can be best explained by a single direct gap which is the minimum in energy and that below the bandgap absorption can be described by a classic Urbach tail, probably associated with the grain boundaries.We have demonstrated that we can alloy the silicide with cobalt and have been able to modify the bandgap energy in a controlled way.We have established definitively that the optical emission at l.5 -m is related to the band edge of the FeSi2 and not, as has been suggested by some groupsl a defect line in silicon. We have shown that strong high temperature luminescence can be obtained from precipitates of the silicide in silicon. We are now in a position to attempt the fabrication of an electroluminescent demonstrator device.
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Organisation Website:	http://www.surrey.ac.uk