DE19522539-A1  Appl. Phys. Lett., 57 (6), 06. August 1990, S. 602-604;  Appl. Phys. Lett., 57 (6), 06081990, S. 602-604WO9701189-A1  APPLIED PHYSICS LETTERS, Bd. 57, Nr. 6, 06/08/1990, Seiten 602-604, XP000150177 WANG A ET AL: "24% EFFICIENT SILICON SOLAR CELLS";  APPLIED PHYSICS LETTERS, vol. 57, no. 6, 06/08/1990, pages 602-604, XP000150177 WANG A ET AL: "24% EFFICIENT SILICON SOLAR CELLS";  PROCEEDINGS OF THE PHOTOVOLTAIC SPECIALISTS CONFERENCE, LOUISVILLE, 10/05/1993 - 14/05/1993, Nr. CONF. 23, 10/05/1993, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, Seiten 271-276, XP000437967 KNOBLOCH J ET AL: "HIGH-EFFICIENCY SOLAR CELLS FROM FZ, CZ AND MC SILICON MATERIAL";  PROCEEDINGS OF THE PHOTOVOLTAIC SPECIALISTS CONFERENCE, LOUISVILLE, 10/05/1993 - 14/05/1993, no. CONF. 23, 10/05/1993, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 271-276, XP000437967 KNOBLOCH J ET AL: "HIGH-EFFICIENCY SOLAR CELLS FROM FZ, CZ AND MC SILICON MATERIAL";  RECORD OF THE PHOTOVOLTAIC SPECIALISTS CONFERENCE, KISSIMIMEE, 21/05/1990 - 25/05/1990, Bd. 1, 21/05/1990, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, Seiten 251-256, XP000480298 CULIK J S ET AL: "DEEPLY-GROOVED SILICON CONCENTRATOR SOLAR CELLS FOR USE WITH PRISMATIC COVERS";  RECORD OF THE PHOTOVOLTAIC SPECIALISTS CONFERENCE, KISSIMIMEE, 21/05/1990 - 25/05/1990, vol. 1, 21/05/1990, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 251-256, XP000480298 CULIK J S ET AL: "DEEPLY-GROOVED SILICON CONCENTRATOR SOLAR CELLS FOR USE WITH PRISMATIC COVERS";  APPLIED PHYSICS LETTERS, Bd. 57, Nr. 6, 6.August 1990, Seiten 602-604, XP000150177 WANG A ET AL: "24% EFFICIENT SILICON SOLAR CELLS" in der Anmeldung erwaehnt;  PROCEEDINGS OF THE PHOTOVOLTAIC SPECIALISTS CONFERENCE, LOUISVILLE, MAY 10 - 14, 1993, Nr. CONF. 23, 10.Mai 1993, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, Seiten 271-276, XP000437967 KNOBLOCH J ET AL: "HIGH-EFFICIENCY SOLAR CELLS FROM FZ, CZ AND MC SILICON MATERIAL";  RECORD OF THE PHOTOVOLTAIC SPECIALISTS CONFERENCE, KISSIMIMEE, MAY 21 - 25, 1990, Bd. 1, 21.Mai 1990, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, Seiten 251-256, XP000480298 CULIK J S ET AL: "DEEPLY-GROOVED SILICON CONCENTRATOR SOLAR CELLS FOR USE WITH PRISMATIC COVERS";  APPLIED PHYSICS LETTERS, Bd. 57, Nr. 6, 6.August 1990, Seiten 602-604, XP000150177 WANG A ET AL: "24% EFFICIENT SILICON SOLAR CELLS" in der Anmeldung erw{hntDE19522539-C2  Appl. Phys. Lett., 57 (6), 06. August 1990, S. 602-604AU716866-B  REC OF THE PHOTO SPEC CONF KISSIMIMEE MAY 21-25 1990 VOL.1 21 MAY 90 INST OF ELECT AND ELECT ENG P 251-256US6147297-A  1990 IEEE "Deeply-Grooved Silicon Concentrator Solar Cells for Use with Prismatic Covers", J.S. Culik, E.L. Jackson and A.M. Barnett, May 21, 1990, pp. 251-256.;  1993 IEEE "High-Efficiency Solar Cells from FZ, CZ and MC Silicon Material", J. Knobloch et al, May 10, 1993, pp. 271-276.;  Applied Physics Letters (1990) No. 6, New York, US-"24% efficient silicon solar cells", pp. 602-604.;  Knobloch et al., "High-Efficiency Solar Cells from FZ, CZ and MC Silicon Material," Proceedings of The Photovoltaic Specialists Conference, 23rd conference, pp. 271-276, May 10, 1993.;  Wang et al., "24% efficient silicon solar cells," Applied Physics Letters, vol. 57, No. 6, pp. 602-604, Aug. 1990.