WO2004013062-A2  ICHINOSE I., SENZU H., KUNITAKE T.: "Stepwise Adsorption of Metal Alkoxydes on Hydrolyzed Surfaces: A Surface Sol-Gel Process" CHEMISTRY LETTERS, vol. 25, no. 10, 1996, pages 831-832, XP002283755;  KAY A ET AL: "DYE-SENSITIZED CORE-SHELL NANOCRYSTALS: IMPROVED EFFICIENCY OF MESOPOROUS TIN OXIDE ELECTRODES COATED WITH A THIN LAYER OF AN INSULATING OXIDE" CHEMISTRY OF MATERIALS, AMERICAN CHEMICAL SOCIETY, WASHINGTON, US, vol. 14, no. 7, July 2002 (2002-07), pages 2930-2935, XP001190713 ISSN: 0897-4756;  PALOMARES EMILIO ET AL: "Slow charge recombination in dye-sensitised solar cells (DSSC) using Al2O3 coated nanoporous TiO2 films." CHEMICAL COMMUNICATIONS (CAMBRIDGE, ENGLAND) 21 JUL 2002, no. 14, 21 July 2002 (2002-07-21), pages 1464-1465, XP002283754 ISSN: 1359-7345;  TENNAKONE K ET AL: "Dye-sensitized solid-state photovoltaic cells: suppression of electron-hole recombination by deposition of the dye on a thin insulating film in contact with a semiconductor" J. ELECTRON. MATER. (USA), JOURNAL OF ELECTRONIC MATERIALS, AUG. 2001, TMS; IEEE, USA, vol. 30, no. 8, August 2001 (2001-08), pages 992-996, XP002283756 ISSN: 0361-5235;  ICHINOSE I ET AL: "A SURFACE SOL-GEL PROCESS OF TIO2 AND OTHER METAL OXIDE FILMS WITH MOLECULAR PRECISION" CHEMISTRY OF MATERIALS, AMERICAN CHEMICAL SOCIETY, WASHINGTON, US, vol. 9, no. 6, 1 June 1997 (1997-06-01), pages 1296-1298, XP000659326 ISSN: 0897-4756 cited in the application;  PALOMARES EMILIO ET AL: "Control of charge recombination dynamics in dye sensitized solar cells by the use of conformally deposited metal oxide blocking layers." JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. 15 JAN 2003, vol. 125, no. 2, 15 January 2003 (2003-01-15), pages 475-482, XP002283757 ISSN: 0002-7863WO2004013062-A3  PALOMARES EMILIO ET AL: "Slow charge recombination in dye-sensitised solar cells (DSSC) using Al2O3 coated nanoporous TiO2 films." CHEMICAL COMMUNICATIONS (CAMBRIDGE, ENGLAND) 21 JUL 2002, no. 14, 21 July 2002 (2002-07-21), pages 1464-1465, XP002283754 ISSN: 1359-7345;  ICHINOSE I., SENZU H., KUNITAKE T.: "Stepwise Adsorption of Metal Alkoxydes on Hydrolyzed Surfaces: A Surface Sol-Gel Process" CHEMISTRY LETTERS, vol. 25, no. 10, 1996, pages 831-832, XP002283755;  ICHINOSE I ET AL: "A SURFACE SOL-GEL PROCESS OF TIO2 AND OTHER METAL OXIDE FILMS WITH MOLECULAR PRECISION" CHEMISTRY OF MATERIALS, AMERICAN CHEMICAL SOCIETY, WASHINGTON, US, vol. 9, no. 6, 1 June 1997 (1997-06-01), pages 1296-1298, XP000659326 ISSN: 0897-4756 cited in the application;  KAY A ET AL: "DYE-SENSITIZED CORE-SHELL NANOCRYSTALS: IMPROVED EFFICIENCY OF MESOPOROUS TIN OXIDE ELECTRODES COATED WITH A THIN LAYER OF AN INSULATING OXIDE" CHEMISTRY OF MATERIALS, AMERICAN CHEMICAL SOCIETY, WASHINGTON, US, vol. 14, no. 7, July 2002 (2002-07), pages 2930-2935, XP001190713 ISSN: 0897-4756;  TENNAKONE K ET AL: "Dye-sensitized solid-state photovoltaic cells: suppression of electron-hole recombination by deposition of the dye on a thin insulating film in contact with a semiconductor" J. ELECTRON. MATER. (USA), JOURNAL OF ELECTRONIC MATERIALS, AUG. 2001, TMS; IEEE, USA, vol. 30, no. 8, August 2001 (2001-08), pages 992-996, XP002283756 ISSN: 0361-5235;  PALOMARES EMILIO ET AL: "Control of charge recombination dynamics in dye sensitized solar cells by the use of conformally deposited metal oxide blocking layers." JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. 15 JAN 2003, vol. 125, no. 2, 15 January 2003 (2003-01-15), pages 475-482, XP002283757 ISSN: 0002-7863