| abstract |
There is provided an organic compound of formula I: <EMI ID=1.1 HE=26 WI=46 LX=843 LY=606 TI=CF> <PC>wherein: <DL TSIZE=4> <DT>Het<DD>is a predominantly planar heterocyclic molecular system; <DT>B<DD>is a binding group; <DT>p<DD>is 3 to 8; <DT>S<DD>is a group providing a solubility of the organic compound (in a water, water-miscible or organic solvent); <DT>m<DD>is 0 to 8; <DT>D<DD>is -Me, -Et, -NO2, -Cl, -Br, -F, -CF3, -CN, -OH, -OMe, -OEt, -O-CO-Me, -OCN, -SCN, -NH2, -NHCO-Me and -CONH2; z is 0 to 4; and wherein the compound absorbs electromagnetic radiation within the range 400 to 3000 nm and a solution of the compound or its salt is capable of forming a photovoltaic layer on a substrate. </DL> There is also provided a semiconductor crystal film (comprising a photovoltaic layer on a substrate) and an organic photovoltaic device (comprising a photovoltaic layer), wherein the photovoltaic layer comprises a compound of formula II <EMI ID=1.2 HE=24 WI=58 LX=776 LY=1829 TI=CF> <PC>wherein: <DL TSIZE=3> <DT>X<DD>is a counterion H<+>, NH4<+>, Mg<2+>, Ca<2+>, Sr<2+>, Ba<2+> or Zn<2+>; and <DT>t<DD>is the number of counterions necessary to provide for the electrical neutrality of compound II. </DL> In one embodiment, these semiconductor films possess a high conductivity in the direction perpendicular to the organic semiconductor layer and are intended for the application in solar cells and in other organic optoelectronic devices. |