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Proceedings Paper

The use of wide-bandgap CuCl on silicon for ultra-violet photonics
Author(s): L. O'Reilly; G. Natarajan; P. J. McNally; S. Daniels; O. F. Lucas; A. Mitra; M. Martinez-Rosas; L. Bradley; A. Reader; D. Cameron
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Paper Abstract

γ-CuCl is a wide-bandgap (Eg = 3.395eV), direct bandgap, semiconductor material with a cubic zincblende lattice structure. Its lattice constant, aCuCl = 0.541 nm, means that the lattice mismatch to Si (aSi = 0.543 nm) is <0.5%. γ-CuCl on Si-the growth of a wide-bandgap, direct bandgap, optoelectronics material on silicon substrates is a novel material system, with compatibility to current Si based electronic/optoelectronics technologies. The authors report on early investigations consisting of the growth of polycrystalline, CuCl thin films on Si (100), Si (111), and quartz substrates by physical vapour deposition. X-ray diffraction (XRD) studies indicate that CuCl grows preferentially in the <111> direction. Photoluminescence (PL) and Cathodoluminescence (CL) reveal a strong room temperature Z3 excitonic emission at ~387nm. A demonstration electroluminescent device (ELD) structure based on the deposition of CuCl on Si was developed. Preliminary electroluminescence measurements confirm UV light emission at wavelengths of ~380nm and ~387nm, due to excitonic behaviour. A further emission occurs in the bandgap region at ~360nm.

Paper Details

Date Published: 3 June 2005
PDF: 8 pages
Proc. SPIE 5825, Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, (3 June 2005); doi: 10.1117/12.602729
Show Author Affiliations
L. O'Reilly, Dublin City Univ. (Ireland)
G. Natarajan, Dublin City Univ. (Ireland)
P. J. McNally, Dublin City Univ. (Ireland)
S. Daniels, Dublin City Univ. (Ireland)
O. F. Lucas, Dublin City Univ. (Ireland)
A. Mitra, Trinity College Dublin (Ireland)
M. Martinez-Rosas, Trinity College Dublin (Ireland)
L. Bradley, Trinity College Dublin (Ireland)
A. Reader, Dublin City Univ. (Ireland)
D. Cameron, Lappeenranta Univ. of Technology (Finland)


Published in SPIE Proceedings Vol. 5825:
Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks
John Gerard McInerney; Harold S. Gamble; Gerald Farrell; David M. Denieffe; Padraig Hughes; R. Alan Moore; Liam Barry, Editor(s)

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