1P-13 : A-D-A Small Molecule Donor based on Benzodithiophene and its Application in Organic Solar Cells

An acceptor-donor-acceptor (A-D-A) small molecule donor, named (BDT-HTOX), was synthesized for the application in organic solar cells (OSCs). Benzodithiophene (BDT) was used as central donor (D) unit and phenylisoxazol (OX) as acceptor (A) unit. Hexylthiophene (HT) ring as a π-bridge to extend the effective conjugation length and increase the solubility of the material. The HUMO/LUMO energy level of BDT-HTOX were -3.72eV/-5.44 eV with an optical band gap of 1.72 eV. The devices based on BDT-HTOX/PC71BM = 1:1 in chlorobenzene as a solvent for solution processed organic solar cells showed the best performance with maximum power conversion efficiency (PCE) up to 0.80%, short-circuit current density (Jsc) of -3.26 mA/cm2, Voc of 0.88 V, and fill factor (FF) of 27.9%.