Patent ID: 7026543

Claim:
A photovoltaic cell having a photovoltaically active semiconductor material constituted by a plurality of metals or metal oxides, wherein the photovoltaically active material is selected from the group consisting of (a) a p- or n-doped semiconductor material constituted by a ternary compound of formula (I) Me x S A y S B z (I) with Me=Al, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Cu or Ag, S A , S B =B, C, Si, Ge, Sb, Se or Te, where S A and S B respectively come from different groups of the periodic table, x, y, z are independent of one another and can take values from 0.01 to 1, and where the proportion by weight of S A and S B together is no more than 30%, expressed in terns of the total semiconductor material, and (b) a mixed oxide of formula (II) [ ( CaO ) u · ( SrO ) v · ( BaO ) w · ( 1 / 2 ⁢ Bi 2 ⁢ O 3 ) x ] f · 2 ⁢ n + a 2 · ( { k } · Me n ⁢ O n 2 ⁢ { 2 - k } · Me n + a ⁢ O n + a 2 ) ( II ) with Me=Fe, Cu, V, Mn, Sn, Ti, Mo, or W, n=integer from 1 to 6, a=1 or 2, f=number from 0.2 to 5, k=number from 0.01 to 2, u+v+w+x= 1.