| abstract |
Solar cell comprising a layer system, at least one layer of the layer system being a light-absorbing layer, this light-absorbing layer comprising a compound of the general Formula I or II ** Formula ** forming - R3, R4 and R5, independently of each other, H or a residue selected from aryl, alkyl, fluorinated or partially fluorinated alkyl, unsaturated alkyl, and - R8 and R9 being selected independently of each other from halogen, alkyl, fluorinated or partially fluorinated alkyl , alkenyl, alkynyl, alkoxy, aryl or heteroaryl, characterized in that - R1 and R2 and R6 and R7 in each case together form a 5-membered ring or a heterocyclic 6-membered ring selected from S, O, N or P , or - R1 and R2 and R6 and R7 in each case together form a 6-membered homocyclic ring, not further condensed, with at least three of the four remaining bonding points of the homocyclic ring remaining unsubstituted, and the compound being according to Formula I or II a donor or donor-acceptor heterotransition. |