EP886325-A  J.K. RATH ET AL.: "Development of amorphous silicon based p-i-n solar cell in a superstrate structure with p-microcrystalline silicon as window layer" CONFERENCE RECORD OF THE 25TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 13 - 17 May 1996, WASHINGTON, DC, USA, pages 1101-1104, XP002047288;  K. MIYACHI ET AL.: "Fabrication of single pin type solar cells with a high conversion efficiency of 13.0%" 11TH E.C. PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 12 - 16 October 1992, MONTREUX, pages 88-91, XP002047286;  M.W.M. VAN CLEEF ET AL.: "Microcristalline-crystalline silicon heterojunction solar cells using highly conductive thin p-type microcrystalline silicon window layers" CONFERENCE RECORD OF THE 25TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 13 - 17 May 1996, WASHINGTON, DC, USA, pages 429-432, XP002047287;  R.E.I. SCHROPP ET AL.: "Bandgap-, dopant-, and defect-graded dual-junction amorphous silicon solar cells" 12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 11 - 15 April 1994, AMSTERDAM, NL, pages 699-702, XP002047289WO9858413-A  J.K. RATH ET AL.: "Development of amorphous silicon based p-i-n solar cell in a superstrate structure with p-microcrystalline silicon as window layer" CONFERENCE RECORD OF THE 25TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 13 - 17 May 1996, pages 1101-1104, XP002047288 WASHINGTON, DC, USA;  K. MIYACHI ET AL.: "Fabrication of single pin type solar cells with a high conversion efficiency of 13.0%" 11TH E.C. PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 12 - 16 October 1992, pages 88-91, XP002047286 MONTREUX cited in the application;  M.W.M. VAN CLEEF ET AL.: "Microcristalline-crystalline silicon heterojunction solar cells using highly conductive thin p-type microcrystalline silicon window layers" CONFERENCE RECORD OF THE 25TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 13 - 17 May 1996, pages 429-432, XP002047287 WASHINGTON, DC, USA;  R.E.I. SCHROPP ET AL.: "Bandgap-, dopant-, and defect-graded dual-junction amorphous silicon solar cells" 12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 11 - 15 April 1994, pages 699-702, XP002047289 AMSTERDAM, NLEP992071-A  See references of WO 9858413A1EP886325-A1  J.K. RATH ET AL.: &quot;Development of amorphous silicon based p-i-n solar cell in a superstrate structure with p-microcrystalline silicon as window layer&quot; CONFERENCE RECORD OF THE 25TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 13 - 17 May 1996, WASHINGTON, DC, USA, pages 1101-1104, XP002047288;  M.W.M. VAN CLEEF ET AL.: &quot;Microcristalline-crystalline silicon heterojunction solar cells using highly conductive thin p-type microcrystalline silicon window layers&quot; CONFERENCE RECORD OF THE 25TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 13 - 17 May 1996, WASHINGTON, DC, USA, pages 429-432, XP002047287;  R.E.I. SCHROPP ET AL.: &quot;Bandgap-, dopant-, and defect-graded dual-junction amorphous silicon solar cells&quot; 12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 11 - 15 April 1994, AMSTERDAM, NL, pages 699-702, XP002047289;  K. MIYACHI ET AL.: &quot;Fabrication of single pin type solar cells with a high conversion efficiency of 13.0%&quot; 11TH E.C. PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 12 - 16 October 1992, MONTREUX, pages 88-91, XP002047286WO9858413-A1  J.K. RATH ET AL.: &quot;Development of amorphous silicon based p-i-n solar cell in a superstrate structure with p-microcrystalline silicon as window layer&quot; CONFERENCE RECORD OF THE 25TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 13 - 17 May 1996, pages 1101-1104, XP002047288 WASHINGTON, DC, USA;  M.W.M. VAN CLEEF ET AL.: &quot;Microcristalline-crystalline silicon heterojunction solar cells using highly conductive thin p-type microcrystalline silicon window layers&quot; CONFERENCE RECORD OF THE 25TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 13 - 17 May 1996, pages 429-432, XP002047287 WASHINGTON, DC, USA;  R.E.I. SCHROPP ET AL.: &quot;Bandgap-, dopant-, and defect-graded dual-junction amorphous silicon solar cells&quot; 12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 11 - 15 April 1994, pages 699-702, XP002047289 AMSTERDAM, NL;  K. MIYACHI ET AL.: &quot;Fabrication of single pin type solar cells with a high conversion efficiency of 13.0%&quot; 11TH E.C. PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 12 - 16 October 1992, pages 88-91, XP002047286 MONTREUX cited in the applicationUS6242687-B1  J.K. Rath et al., "Development of Amorphous Silicon Based P-I-N Solar Cell in A Superstrate Structure Wtih P-Microcrystalline Silicon as Window Layer," 25th PVSC; May 1996; pp. 1101-1104.;  K. Miyachi et al., "Fabrication of Single Pin Type Solar Cells with a High Conversion Efficiency of 13.0% Photovoltaic Solar Energy Conference," Oct. 1992, pp. 88-91.;  M.W.M. van Cleef et al., "Microcrystalline-Crystalline Silicon Heterojunction Solar Cells Using Highly Conductive Thin P-Type Microcrystalline Silicon Window Layers," 25th PVSC; May 1996; pp. 42-43.;  R.E.I. Schropp et al., "Bandgap-, dopant-, and defect-graded dual-junction amorphous silicon solar cells", European Photovoltaic Solar Energy Conference, Apr. 1994, pp. 699-702.