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EP 1 834 362 A1

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(43) Date of publication: 19.09.2007 Bulletin 2007/38 (21) Application number: 05823569.8 (22) Date of filing: 13.12.2005

(51) International Patent Classification (IPC):  H01L 31/052(2006.01) (86) International application number: PCT/IT2005/000729 (87) International publication number: WO 2006/070425 (06.07.2006 Gazette 2006/27)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 29.12.2004 IT RM20040646 (71) Applicants: ENI S.p.A. 00144 Roma (IT) Ente per le Nuove Tecnologie, l'Energia e l'Ambiente - ENEA 00196 Rome (IT)

(72) Inventors: SARNO, Angelo I-00061 Anguillara Sabazia (RM) (IT) PRIVATO, Carlo I-84134 Salerno (IT) ROCA, Francesco I-84129 Salerno (IT) AVITABILE, Marino I-84013 Cava dei Tirreni (Salerno) (IT) NACCI, Vito, Rocco I-00125 Roma (IT) FERRAZZA, Francesca I-00048 Nettuno (RM) (IT) ZARCONE, Mariano I-00048 Nettuno (RM) (IT) (74) Representative: Sarpi, Maurizio  Studio FERRARIO Via Collina, 36 I-00187 Roma I-00187 Roma (IT)