EP776051-A2  CONF. RECORD 23RD IEEE PHOTOVOLTAIC SPECIALISTS 1993,, page 157 R.A. SINTON ET AL. 'Large-Area 21% Efficient Si Solar Cells';  CONF. RECORD 23RD IEEE PHOTOVOLTAIC SPECIALISTS CONF. 1993, LOUISVILLE, KY, Y.S. TSUO ET AL. 'Potential Applications of Porous Silicon in Photovoltaics';  IEEE ELECTRON DEVICE LETT. vol. EDL-7, no. 7, 1986,, page 567 R.A. SINTON ET AL.;  CHEEK C ET AL: "ALUMINUM ALLOY HIGH EFFICIENCY SOLAR CELLS" PHOTOVOLTAIC SPECIALISTS CONFERENCE, LAS VEGAS, OCT. 21 - 25, 1985, vol. VOL. 1, no. CONF. 18, 21 October 1985, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 190-191, XP000132007;  MEIER D L ET AL: "DENDRITIC WEB SILICON SOLAR CELLS" JOURNAL OF PROPULSION AND POWER, vol. 4, no. 6, 1 November 1988, pages 586-590, XP000112210;  PATENT ABSTRACTS OF JAPAN vol. 015, no. 405 (E-1122), 16 October 1991 & JP 03 165578 A (HITACHI LTD), 17 July 1991,;  SINTON, R.A. ET AL.: "Improvements in Silicon Backside-contacts Solar Cells for High-Value One-Sun Applications" PROCEEDINGS OF THE 13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 23 - 27 October 1995, NICE, FRANCE, pages 1586-1589, XP002063523;  VERLINDEN, P.J. ET AL.: "High efficiency silicon point-contact solar cells for concentrators and high value one-sun applications" PROCEEDINGS OF THE 12TH EUROPEAN SOLAR ENERGY CONFERENCE, 11 - 15 April 1994, AMSTERDAM, pages 1477-1480, XP002063522US5641362-A  S. Chiang et al, IEEE Trans. Electron Der., vol. ED-25, Dec. 1978, pp. 1405-1409.EP776051-B1  CHEEK C ET AL: "ALUMINUM ALLOY HIGH EFFICIENCY SOLAR CELLS" PHOTOVOLTAIC SPECIALISTS CONFERENCE, LAS VEGAS, OCT. 21 - 25, 1985, vol. VOL. 1, no. CONF. 18, 21 October 1985, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 190-191, XP000132007;  MEIER D L ET AL: "DENDRITIC WEB SILICON SOLAR CELLS" JOURNAL OF PROPULSION AND POWER, vol. 4, no. 6, 1 November 1988, pages 586-590, XP000112210;  PATENT ABSTRACTS OF JAPAN vol. 015, no. 405 (E-1122), 16 October 1991 & JP 03 165578 A (HITACHI LTD), 17 July 1991,;  SINTON, R.A. ET AL.: "Improvements in Silicon Backside-contacts Solar Cells for High-Value One-Sun Applications" PROCEEDINGS OF THE 13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, 23 - 27 October 1995, NICE, FRANCE, pages 1586-1589, XP002063523;  VERLINDEN, P.J. ET AL.: "High efficiency silicon point-contact solar cells for concentrators and high value one-sun applications" PROCEEDINGS OF THE 12TH EUROPEAN SOLAR ENERGY CONFERENCE, 11 - 15 April 1994, AMSTERDAM, pages 1477-1480, XP002063522