WO9414199-A1  See also references of EPA 0673550;  See also references of EP 0673550A1EP673550-A1  APPLIED PHYSICS LETTERS, 14 DEC. 1992, USA, vol. 61, no. 24, ISSN 0003-6951, pages 2917-2919, XP000335207 YANG J ET AL: "Double-junction amorphous silicon-based solar cells with 11% stable efficiency";  IEEE TRANSACTIONS ON ELECTRON DEVICES, vol. 37, no. 7, 1 July 1990, pages 1758-1762, XP000133275 PAWLIKIEWICZ A H ET AL: "PERFORMANCE COMPARISON OF TRIPLE AND TANDEM MULTI-JUNCTION A-SI: H SOLAR CELLS: A NUMERICAL STUDY";  PATENT ABSTRACTS OF JAPAN vol. 016, no. 091 (E-1174), 5 March 1992 & JP 03 273614 A (CANON INC), 4 December 1991,;  PROCEEDINGS OF THE INTERNATIONAL PHOTOVOLTAIC ENERGY CONFERENCE, FLORENCE, MAY 9 - 13, 1988, vol. 1, 9 May 1988, SOLOMON I;EQUER B; HELM P, pages 871-875, XP000075196 GUNZEL E ET AL: "AMORPHOUS SI1-XGWX:H ALLOYS FOR TANDEM SOLAR CELLS WITH OPTIMIZED ELECTRON AND UT-PRODUCTS";  See also references of WOA 9414199;  PATENT ABSTRACTS OF JAPAN vol. 016, no. 091 (E-1174), 5 March 1992&JP 03 273614 A (CANON INC), 4 December 1991,;  See also references of WO 9414199A1EP673550-A4  PAWLIKIEWICZ A H ET AL: "PERFORMANCE COMPARISON OF TRIPLE AND TANDEM MULTI-JUNCTION A-SI: H SOLAR CELLS: A NUMERICAL STUDY", IEEE TRANSACTIONS ON ELECTRON DEVICES, vol. 37, no. 7, 1 July 1990 (1990-07-01), pages 1758 - 1762, XP000133275,relevantClaims[1,4,5,8-15],relevantPassages[&lt;pp&gt;A&lt;/pp&gt;&lt;figure&gt;1&lt;/figure&gt;|&lt;table&gt;1,2&lt;/table&gt;];  PATENT ABSTRACTS OF JAPAN vol. 016, no. 091 (E - 1174) 5 March 1992 (1992-03-05),relevantClaims[1-3,8],relevantPassages[&lt;pp&gt;A&lt;/pp&gt;];  GUNZEL E ET AL: "AMORPHOUS SI1-XGWX:H ALLOYS FOR TANDEM SOLAR CELLS WITH OPTIMIZED ELECTRON AND UT-PRODUCTS", PROCEEDINGS OF THE INTERNATIONAL PHOTOVOLTAIC ENERGY CONFERENCE, FLORENCE, MAY 9 - 13, 1988, vol. 1, 9 May 1988 (1988-05-09), SOLOMON I;EQUER B; HELM P, pages 871 - 875, XP000075196,relevantClaims[1,2,8,14,15],relevantPassages[&lt;pp&gt;A&lt;/pp&gt;&lt;figure&gt;1,2&lt;/figure&gt;|&lt;para&gt;1&lt;/para&gt;|&lt;para&gt;2&lt;/para&gt;];  YANG J ET AL: "Double-junction amorphous silicon-based solar cells with 11% stable efficiency", APPLIED PHYSICS LETTERS, 14 DEC. 1992, USA, vol. 61, no. 24, ISSN 0003-6951, pages 2917 - 2919, XP000335207,relevantClaims[1,4,8-10,14,15],relevantPassages[&lt;pp&gt;A&lt;/pp&gt;&lt;table&gt;1&lt;/table&gt;|&lt;pp&gt;2917&lt;/pp&gt;&lt;column&gt;1&lt;/column&gt;&lt;line&gt;1&lt;/line&gt;&lt;coll&gt;2&lt;/coll&gt;&lt;linel&gt;17&lt;/linel&gt;];  See also references of WO 9414199A1EP673550-B1  APPLIED PHYSICS LETTERS, 14 DEC. 1992, USA, vol. 61, no. 24, ISSN 0003-6951, pages 2917-2919, XP000335207 YANG J ET AL: "Double-junction amorphous silicon-based solar cells with 11% stable efficiency";  IEEE TRANSACTIONS ON ELECTRON DEVICES, vol. 37, no. 7, 1 July 1990, pages 1758-1762, XP000133275 PAWLIKIEWICZ A H ET AL: "PERFORMANCE COMPARISON OF TRIPLE AND TANDEM MULTI-JUNCTION A-SI: H SOLAR CELLS: A NUMERICAL STUDY";  PATENT ABSTRACTS OF JAPAN vol. 016, no. 091 (E-1174), 5 March 1992 & JP 03 273614 A (CANON INC), 4 December 1991,;  PROCEEDINGS OF THE INTERNATIONAL PHOTOVOLTAIC ENERGY CONFERENCE, FLORENCE, MAY 9 - 13, 1988, vol. 1, 9 May 1988, SOLOMON I;EQUER B; HELM P, pages 871-875, XP000075196 GUNZEL E ET AL: "AMORPHOUS SI1-XGWX:H ALLOYS FOR TANDEM SOLAR CELLS WITH OPTIMIZED ELECTRON AND UT-PRODUCTS"EP673550-B2  APPLIED PHYSICS LETTERS, 14 DEC. 1992, USA, vol. 61, no. 24, ISSN 0003-6951, pages 2917-2919, XP000335207 YANG J ET AL: "Double-junction amorphous silicon-based solar cells with 11% stable efficiency";  IEEE TRANSACTIONS ON ELECTRON DEVICES, vol. 37, no. 7, 1 July 1990, pages 1758-1762, XP000133275 PAWLIKIEWICZ A H ET AL: "PERFORMANCE COMPARISON OF TRIPLE AND TANDEM MULTI-JUNCTION A-SI: H SOLAR CELLS: A NUMERICAL STUDY";  PATENT ABSTRACTS OF JAPAN vol. 016, no. 091 (E-1174), 5 March 1992 & JP 03 273614 A (CANON INC), 4 December 1991,;  PROCEEDINGS OF THE INTERNATIONAL PHOTOVOLTAIC ENERGY CONFERENCE, FLORENCE, MAY 9 - 13, 1988, vol. 1, 9 May 1988, SOLOMON I;EQUER B; HELM P, pages 871-875, XP000075196 GUNZEL E ET AL: "AMORPHOUS SI1-XGWX:H ALLOYS FOR TANDEM SOLAR CELLS WITH OPTIMIZED ELECTRON AND UT-PRODUCTS"