| 초록 |
Poly(quarterthiophene-alt-benzothiadiazole), PQT12oBT, was synthesized through the Stille coupling reaction. The UV-visible absorption spectrum exhibited a higher molar absorption coefficient (ε = 44k M-1cm-1 at 535 nm) in solution state. The HOMO energy levels was -5.18 eV. From the results of X-ray diffraction measurements, the lamellar d-spacing of PQT12oBT in out-of-plane direction was determined to be 21.6 Å, and the π-π stacking distance between layers was found to be 4.09 Å, with a slight edge-on orientation. With a 1:1 ratio of PQT12oBT and PC71BM, the values of open circuit voltage (Voc), short circuit current density (Jsc), fill factor (FF), and power conversion efficiency (PCE) were found to be 0.77 V, 8.9 mA/cm2, 62.4%, and 4.2%, respectively. |
