(19)

(11)

EP 2 721 641 A2

(12)

(88) Date of publication A3: 25.04.2013 (43) Date of publication: 23.04.2014 Bulletin 2014/17 (21) Application number: 12730684.3 (22) Date of filing: 13.06.2012

(51) International Patent Classification (IPC):  H01L 31/0224(2006.01) (86) International application number: PCT/NL2012/050412 (87) International publication number: WO 2012/173474 (20.12.2012 Gazette 2012/51)

(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 RS SE SI SK SM TR (30) Priority: 14.06.2011 NL 2006933 (71) Applicant: Stichting Energieonderzoek Centrum Nederland 1755 LE Petten (NL)	(72) Inventors: VAN ROOSMALEN, Johannes Adrianus Maria NL-1755 LE Petten (NL) BENDE, Evert Eugène NL-1755 LE Petten (NL) CESAR, Ilkay NL-1733 LE Petten (NL) (74) Representative: Jansen, Cornelis Marinus et al V.O. Johan de Wittlaan 7 2517 JR Den Haag 2517 JR Den Haag (NL)