EP715358-A2  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 11. - 15.April 1994, AMSTERDAM, NL, Seiten 1743-1746, XP002039462 M. BODEGARD ET AL.: "The influence of sodium on the grain structure of CuInSe2 films for photovoltaic applications";  PROCEEDINGS OF THE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, LOUISVILLE, MAY 10 - 14, 1993, Nr. CONF. 23, 10. - 14.Mai 1993, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, Seiten 364-371, XP000437970 HEDSTROM J ET AL: "ZNOCDSCU(IN,GA)SE2 THIN FILM SOLAR CELLS WITH IMPROVED PERFORMANCE";  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 11. - 15.April 1994, AMSTERDAM, NL, Seiten 1592-1595, XP002039461 J. HOLZ ET AL.: "The effect of substrate impurities on the electronic conductivity in CIS thin films";  13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 23. - 27.Oktober 1995, NICE, FR, Seiten 2123-2126, XP002039463 V. PROBST ET AL.: "Improved CIS thin film solar cells through novel impurity control techniques";  PROCEEDINGS OF THE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, LOUISVILLE, MAY 10 - 14, 1993, Nr. CONF. 23, 10. - 14.Mai 1993, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, Seiten 364-371, XP000437970 HEDSTROM J ET AL: "ZNO/CDS/CU(IN,GA)SE2 THIN FILM SOLAR CELLS WITH IMPROVED PERFORMANCE"EP715358-B1  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 11. - 15.April 1994, AMSTERDAM, NL, Seiten 1592-1595, XP002039461 J. HOLZ ET AL.: "The effect of substrate impurities on the electronic conductivity in CIS thin films";  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 11. - 15.April 1994, AMSTERDAM, NL, Seiten 1743-1746, XP002039462 M. BODEGARD ET AL.: "The influence of sodium on the grain structure of CuInSe2 films for photovoltaic applications";  PROCEEDINGS OF THE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, LOUISVILLE, MAY 10 - 14, 1993, Nr. CONF. 23, 10. - 14.Mai 1993, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, Seiten 364-371, XP000437970 HEDSTROM J ET AL: "ZNO/CDS/CU(IN,GA)SE2 THIN FILM SOLAR CELLS WITH IMPROVED PERFORMANCE";  13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 23. - 27.Oktober 1995, NICE, FR, Seiten 2123-2126, XP002039463 V. PROBST ET AL.: "Improved CIS thin film solar cells through novel impurity control techniques"EP715358-B2  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 11. - 15.April 1994, AMSTERDAM, NL, Seiten 1592-1595, XP002039461 J. HOLZ ET AL.: "The effect of substrate impurities on the electronic conductivity in CIS thin films";  12TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 11. - 15.April 1994, AMSTERDAM, NL, Seiten 1743-1746, XP002039462 M. BODEGARD ET AL.: "The influence of sodium on the grain structure of CuInSe2 films for photovoltaic applications";  PROCEEDINGS OF THE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, LOUISVILLE, MAY 10 - 14, 1993, Nr. CONF. 23, 10. - 14.Mai 1993, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, Seiten 364-371, XP000437970 HEDSTROM J ET AL: "ZNO/CDS/CU(IN,GA)SE2 THIN FILM SOLAR CELLS WITH IMPROVED PERFORMANCE";  13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, Bd. 2, 23. - 27.Oktober 1995, NICE, FR, Seiten 2123-2126, XP002039463 V. PROBST ET AL.: "Improved CIS thin film solar cells through novel impurity control techniques"