Ali Yassin

Donor–acceptor–donor (D–A–D) molecules based on isoindigo as active material for organic solar cells

Two D–A–D systems involving benzofuran and dithienopyrrole as donor blocks and isoindigo as an acceptor unit have been synthesized and their electronic properties have been characterized by UV-Vis absorption spectroscopy and cyclic voltammetry. A preliminary evaluation of these compounds as active material in organic solar cells shows that the presence or absence of substitution at the nitrogen atom of indigo strongly affects the properties of the material and thus the performances of the resulting solar cells.

A donor–acceptor–donor (D–A–D) molecule based on 3-alkoxy-4-cyanothiophene and dithienopyrrole units as active material for organic solar cells

A symmetrical donor–acceptor–donor D–A–D system built by connecting two dithienopyrrole donor blocks to a central electron acceptor obtained by dimerization of 3-alkoxy-4-cyano-thiophene has been synthesized and characterized. The compound combines a high photoluminescence efficiency with a broad absorption spectrum in the solid state and a band gap of 1.70 eV. A preliminary evaluation of the potentialities of this type of compound as donor material in bulk heterojunction solar cells using PC61BM as electron acceptor is presented.