EP773590-A1  None;  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 11 - 15 Avril 1994, AMSTERDAM, NL, pages 780-783, XP002008175 S. BASTIDE ET AL.: "The effect of porous silicon on the emitter of a photovoltaic cell";  13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 23 - 27 Octobre 1995, NICE, FR, pages 37-40, XP002008173 E. VAZSONYI ET AL.: "High efficiency silicon pv cells with surface treatment by anodic etching";  23RD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 10 - 14 Mai 1993, LOUISVILLE, USA, pages 287-293, XP002008174 Y.S. TSUO ET AL.: "Potential application of porous silicon in photovoltaics";  PATENT ABSTRACTS OF JAPAN vol. 15, no. 258 (E-1084) 28 Juin 1991 & JP-A-03 083 339 (SUMITOMO ELECTRIC IND. LTD.) 09 Avril 1991;  SOLAR ENERGY MATERIALS AND SOLAR CELLS, vol. 37, no. 1, Avril 1995, AMSTERDAM NL, pages 13-24, XP000517030 P. MENNA ET AL.: "Porous silicon in solar cells: a review and a description of its application as an AR coating";  PATENT ABSTRACTS OF JAPAN vol. 15, no. 258 (E-1084) 28 Juin 1991&JP-A-03 083 339 (SUMITOMO ELECTRIC IND. LTD.) 09 Avril 1991FR2741194-A1  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 11 - 15 Avril 1994, AMSTERDAM, NL, pages 780-783, XP002008175 S. BASTIDE ET AL.: "The effect of porous silicon on the emitter of a photovoltaic cell";  13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 23 - 27 Octobre 1995, NICE, FR, pages 37-40, XP002008173 E. VAZSONYI ET AL.: "High efficiency silicon pv cells with surface treatment by anodic etching";  23RD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 10 - 14 Mai 1993, LOUISVILLE, USA, pages 287-293, XP002008174 Y.S. TSUO ET AL.: "Potential application of porous silicon in photovoltaics";  PATENT ABSTRACTS OF JAPAN vol. 15, no. 258 (E-1084), 28 Juin 1991 & JP-A-03 083339 (SUMITOMO ELECTRIC IND. LTD.), 9 Avril 1991,;  SOLAR ENERGY MATERIALS AND SOLAR CELLS, vol. 37, no. 1, Avril 1995, AMSTERDAM NL, pages 13-24, XP000517030 P. MENNA ET AL.: "Porous silicon in solar cells: a review and a description of its application as an AR coating"US5949123-A  E. Vazsonyi et al, "High efficiency silicon pv cells with surface treatment by anodic etching", 13th European Photovoltaic Solar Energy Conference, Oct. 23-27, 1995, pp. 37-40.;  P. Menna et al, "Porous Silicon in Solar Cells: a review and a description of its application as an AR coating", Solar Energy Material and Solar Cells, vol. 37, No. 1 Apr. 1995, Amsterdam NL, pp. 13-24.;  Patent Abstracts of Japan, vol. 15, No. 258 (E-1084) Jun. 28, 1991 corresponding to JP-A-03 083339 (Sumitomo Electric Ind. Ltd.) Apr. 9, 1991.;  S. Bastide et al, "The effect of porous silicon on the emitter of a photovoltaic cell", 12th European Photovoltaic Solar Energy Conference, Apr. 11-15, 1994, Amsterdam, NL, pp. 780-783.;  Y. S. Tsuo et al, "Potential application of porous silicon in photovoltaics", 23rd IEEE Phtovoltaic Specialists Conference, May 10-14,1993, Louisville, USA, pp. 287-293.EP773590-B1  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 11 - 15 Avril 1994, AMSTERDAM, NL, pages 780-783, XP002008175 S. BASTIDE ET AL.: "The effect of porous silicon on the emitter of a photovoltaic cell";  13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 23 - 27 Octobre 1995, NICE, FR, pages 37-40, XP002008173 E. VAZSONYI ET AL.: "High efficiency silicon pv cells with surface treatment by anodic etching";  23RD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 10 - 14 Mai 1993, LOUISVILLE, USA, pages 287-293, XP002008174 Y.S. TSUO ET AL.: "Potential application of porous silicon in photovoltaics";  PATENT ABSTRACTS OF JAPAN vol. 15, no. 258 (E-1084) 28 Juin 1991 & JP-A-03 083 339 (SUMITOMO ELECTRIC IND. LTD.) 09 Avril 1991;  SOLAR ENERGY MATERIALS AND SOLAR CELLS, vol. 37, no. 1, Avril 1995, AMSTERDAM NL, pages 13-24, XP000517030 P. MENNA ET AL.: "Porous silicon in solar cells: a review and a description of its application as an AR coating"