Synthesis and Characterization of Novel D-A Conjugated Polymers Based on Fluorinated Quinoxaline and Thiophene Series for Polymer Solar Cells

다국어 초록 (Multilingual Abstract)

<P>A series of fluorinated quinoxaline-based donor-acceptor alternating copolymers for application in bulk heterojunction polymer solar cells, P2TDFQx, P2TFQx, PTTDFQx, and PTTFQx, were designed and synthesized. The introduction of the electron-withdrawing fluorine atoms to the quinoxaline moiety lowers the highest occupied molecular orbital energy levels of the resulting polymers, which is beneficial for achieving high V-OC and long-term stability. The thermal decomposition temperatures (5% weight loss) of these polymers were over 390 degrees C, indicating excellent thermal stability. Films of these polymers showed broad absorption bands between 350 and 700 nm and low HOMO energy levels ranging from -5.25 to -5.47 eV. PTTDFQx had the highest efficiency in PSCs, with a V-OC of 0.70 V, a J(SC) of 5.51 mA/cm(2), and an FF of 0.40, resulting in a PCE of 1.53%.</P>