(19)

(11)

EP 2 443 667 A2

(12)

(88) Date of publication A3: 08.12.2011 (43) Date of publication: 25.04.2012 Bulletin 2012/17 (21) Application number: 09787755.9 (22) Date of filing: 17.06.2009

(51) International Patent Classification (IPC):  H01L 31/048(2006.01) (86) International application number: PCT/IT2009/000265 (87) International publication number: WO 2010/146607 (23.12.2010 Gazette 2010/51)

(84) Designated Contracting States: 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 TR (71) Applicant: System Photonics S.P.A. 41042 Fiorano Modenese, Modena (IT)	(72) Inventors: STEFANI, Franco I-41049 Sassuolo Modena (IT) RUSSO, Attilio I-21049 Tradate Milano (IT) AIAZZI, Gianluca I-20100 Milano (IT) (74) Representative: Gotra, Stefano  BUGNION S.p.A. Via M. Vellani Marchi, 20 41124 Modena 41124 Modena (IT)