ES2302663-A1  CUADRA, L. y col. Present status of intermediate band solar cell research, Thin solid Films, 2004, Vol 451-452, p ginas 593-599. P rrafo &quot;Present status in IBSC research&quot;.;  TABLERO, C. y col. Properties of intermediate band materials. Solar Energy Materials &amp; Solar Cells, 2005, Vol. 87, p ginas 323-331. Figura 2 y p rrafo &quot;Conclusions&quot;.;  WAHNON, P. y col. Ab-inition spin polarized electronic structure calculations for TixGanAsm photovoltaic materials. Journal of Materials Science, 2005, Vol. 40, p ginas 1383-1386.;  YU, K.M. y col. Diluted II-Vi oxide semiconductors with multiple band gaps. Physical Review Letters, 2003, Vol. 91, 246403. Resumen.EP2256791-A1  WAHNON P ET AL: &quot;Ab-initio spin polarized electronic structure calculations for TixGanAsm photovoltaic materials&quot;, JOURNAL OF MATERIALS SCIENCE KLUWER ACADEMIC PUBLISHERS USA, vol. 40, no. 6, March 2005 (2005-03), pages 1383-1386, XP002632751, ISSN: 0022-2461;  See also references of WO 2009106654A1WO2009106654-A1  A. LUQUE ET AL. APPLIED PHYSICS LETTERS vol. 87, 20 May 0001, pages 083505 - 3;  A. LUQUE ET AL. IEEE TRANSACTIONS ON ELECTRON DEVICES vol. 50, 20 March 0001, pages 447 - 454;  A. LUQUE ET AL. PHYSICA B vol. 382, 20 June 0001, pages 320 - 327;  A. LUQUEA. MARTI PHYSICAL REVIEW LETTERS vol. 78, 19 January 0008, pages 5014 - 5017;  A. LUQUEA. MARTI PROGRESS IN PHOTOVOLTAICS: RES. APPL. vol. 9, 20 January 0001, pages 73 - 86;  A. MARTI ET AL. PHYSICAL REVIEW LETTERS vol. 97, 20 June 0001, pages 247701 - 4;  A. MARTI ET AL. PROC. OF THE 28TH IEEE PHOTOVOLTAICS SPECIALISTS CONFERENCE 20 December 0002,;  C. TABLERO: &apos;74&apos; PHYSICAL REVIEW B 20 June 0001,;  K. M. YU ET AL. APPLIED PHYSICS LETTERS vol. 88, 20 June 0001, page 092110;  P. PALACIOS ET AL. PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE vol. 203, 20 June 0001, pages 1395 - 1401;  P. PALACIOS ET AL. PHYSICAL REVIEW B vol. 73, 20 June 0001,;  See also references of EP 2256791A1;  YU ET AL. PHYSICAL REVIEW LETTERS vol. 91, 20 March 0001, page 246403;  CUADRA, L. ET AL.: &apos;Present status of intermediate band solar cell research&apos; THIN SOLID FILMS vol. 451-452, 2004, pages 593 - 599;  TABLERO, C. ET AL.: &apos;Properties of intermediate band materials&apos; SOLAR ENERGY MATERIALS &amp; SOLAR CELLS vol. 87, 2005, pages 323 - 331;  WAHNON, P. ET AL.: &apos;Ab-initio spin polarized electronic structure calculations for TixGanAsm photovoltaic materials&apos; JOURNAL OF MATERIALS SCIENCE vol. 40, 2005, pages 1383 - 1386;  YU, K.M. ET AL.: &apos;Diluted II-VI oxide semiconductors with multiple band gaps.&apos; PHYSICAL REVIEW LETTERS vol. 91, 11 December 2003, page 246403