화학공학소재연구정보센터
Solar Energy Materials and Solar Cells, Vol.123, 112-121, 2014
Correlation of intramolecular charge transfer and orientation properties among quinacridone and acceptor units
This study synthesized a highly soluble quinacridone-acceptor series (PQCDTB, PQCDTQ-a, PQCDTQ-b) through the Suzuki coupling reaction by introducing planar quinacridone and a highly soluble acceptor unit. The polymers largely dissolved organic solvents, and the M-n ranged from 40.5 to 63.1 kg/mol. The intermolecular charge transfer (ICT) effects were much stronger in PQCDTQ-b than in PQCDTB and PQCDTQ due to the position of the oxygen atom. The HOMO and LUMO levels of the polymers were -5.18 to -5.37 eV and -3.28 to -3.40 eV, respectively. According to XRD measurements, PQCDTB exhibited the formation of an ordered lamellar structure and conventional edge-on pi-stacking, whereas PQCDTQ-a and PQCDTQ-b exhibited face-on formation relative to the substrate. The open-circuit voltage (V-oc), short-circuit current (J(sc)), fill factor (FF), and power conversion efficiency (PCE) were 0.85 V, 7.6 mA/cm(2), 61.5%, and 4.0%, respectively, for PQCDTQ-a with a 1:2 ratio of PC71BM. (C) 2013 Elsevier B.V. All rights reserved.