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OF THE 25TH PVSC CONFERENCE, MAY 13-17 1996, WASHINGTON D.C., USA, IEEE, 13 May 1996 (1996-05-13), pages 653-656, XP010208236;  ELGAMEL H E ET AL: "EFFICIENT COMBINATION OF SURFACE AND BULK PASSIVATION SCHEMES OF HIGH-EFFICIENCY MULTICRYSTALLINE SILICON SOLAR CELLS" JOURNAL OF APPLIED PHYSICS, AMERICAN INSTITUTE OF PHYSICS. 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WAIKOLOA, DEC. 5 - 9, 1994, NEW YORK, IEEE, US, vol. VOL. 2 CONF. 1, 5 December 1994 (1994-12-05), pages 1331-1334, XP000680085 ISBN: 0-7803-1460-3;  VERMEULEN T ET AL: "Interaction between bulk and surface passivation mechanisms in thin film solar cells on defected silicon substrates" PROC. OF THE 25TH PVSC CONFERENCE, MAY 13-17 1996, WASHINGTON D.C., USA, IEEE, 13 May 1996 (1996-05-13), pages 653-656, XP010208236;  ELGAMEL H E ET AL: "EFFICIENT COMBINATION OF SURFACE AND BULK PASSIVATION SCHEMES OF HIGH-EFFICIENCY MULTICRYSTALLINE SILICON SOLAR CELLS" JOURNAL OF APPLIED PHYSICS, AMERICAN INSTITUTE OF PHYSICS. NEW YORK, US, vol. 78, no. 5, 1 September 1995 (1995-09-01), pages 3457-3461, XP000541608 ISSN: 0021-8979;  ROHATGI A ET AL: "COMPREHENSIVE STUDY OF RAPID, LOW-COST SILICON SURFACE PASSIVATION TECHNOLOGIES" IEEE TRANSACTIONS ON ELECTRON DEVICES, IEEE SERVICE CENTER, PISACATAWAY, NJ, US, vol. 47, no. 5, May 2000 (2000-05), pages 987-993, XP000928620 ISSN: 0018-9383;  NAGAYOSHI H ET AL: "The stability of SiNx:H/SiO2 double-layer passivation with Hydrogen-radical annealing" PROCEEDINGS OF THE EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, vol. 1, 30 June 1997 (1997-06-30), pages 739-742, XP002160392