(19)

(11)

EP 3 398 208 A1

(12)

(43) Date of publication: 07.11.2018 Bulletin 2018/45 (21) Application number: 15828816.7 (22) Date of filing: 28.12.2015

(51) International Patent Classification (IPC):  H01L 31/0236(2006.01) H01L 31/068(2012.01) (86) International application number: PCT/EP2015/081305 (87) International publication number: WO 2017/114553 (06.07.2017 Gazette 2017/27)

(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 Designated Extension States: BA ME Designated Validation States: MA MD (71) Applicant: International Solar Energy Research Center Konstanz E.V. 78467 Konstanz (DE)	(72) Inventors: PREIS, Pirmin 78467 Konstanz (DE) BUCHHOLZ, Florian 78462 Konstanz (DE) (74) Representative: Westphal, Mussgnug & Partner Patentanwälte mbB  Am Riettor 5 78048 Villingen-Schwenningen 78048 Villingen-Schwenningen (DE)