(19)

(11)

EP 2 705 539 A1

(12)

(43) Date of publication: 12.03.2014 Bulletin 2014/11 (21) Application number: 12779520.1 (22) Date of filing: 26.04.2012

(51) International Patent Classification (IPC):  H01L 31/04(2014.01) H01L 31/048(2014.01) H01L 51/42(2006.01) (86) International application number: PCT/IB2012/052074 (87) International publication number: WO 2012/150529 (08.11.2012 Gazette 2012/45)

(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: 02.05.2011 EP 11164482 06.12.2011 EP 11192106 (71) Applicant: BASF SE 67056 Ludwigshafen (DE)	(72) Inventors: BRUDER, Ingmar 67376 Harthausen (DE) SENS, Rüdiger 67069 Ludwigshafen (DE) GROB, Markus CH-4153 Reinach (CH) SCHULZE TILLING, Ursula 48155 Münster (DE) (74) Representative: Stößel, Matthias  Herzog Fiesser & Partner Patentanwälte Dudenstrasse 46 68167 Mannheim 68167 Mannheim (DE)