Molecular Crystals and Liquid Crystals, Vol.660, No.1, 66-71, 2018
New A-D-A type small molecules based on benzodithiophene derivative for organic solar cells
A synthesized of acceptor-donor-acceptor (A-D-A) type oligomer based on benzodithiophene (BDT) as a donor (D) unit and phenylisoxazol (OX) as an acceptor (A) is to investigate the effect of combination between the strong electron donor and a strong electron acceptor. In addition, we introduce hexylthiophene (HT) ring as a -bridge to extend the effective conjugation length and increase the solubility. Here we report the performance of 2,6-(4-(thiophen-2-yl)methylene)-3-phenylisoxazol-5(4H)-one)-4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b]dithiophene)(BDT-HTOX) employing as the electron donor in the inverted organic solar cells and PC71BM as the electron acceptor unit. UV-Vis absorption and electrochemical measurements investigated the optoelectronic properties that revealing the HUMO/LUMO level at -3.72eV/-5.44eV with an optical band gap of 1.72eV for BDT-HTOX. Maximum power conversion efficiency based on BDT-HTOX is showed up to 0.80% with a short-circuit current density (J(sc)) of -3.26mA/cm(2), V-oc of 0.88V, and fill factor (FF) of 27.9% using chlorobenzene as a solvent for solution processed organic solar cells.