(19)

(11)

EP 2 430 679 A1

(12)

(43) Date of publication: 21.03.2012 Bulletin 2012/12 (21) Application number: 10721183.1 (22) Date of filing: 14.05.2010

(51) International Patent Classification (IPC):  H01L 51/42(2006.01) (86) International application number: PCT/GB2010/000972 (87) International publication number: WO 2010/131011 (18.11.2010 Gazette 2010/46)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 14.05.2009 GB 0908240 (71) Applicant: The University Of Warwick Coventry CV4 8UW (GB)	(72) Inventors: JONES, Timothy Coventry CV4 7AL (GB) HATTON, Ross Coventry CV4 7AL (GB) SCHUMANN, Stefan Coventry CV4 7AL (GB) (74) Representative: Butler, Michael John  Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)