All-polymer solar cells based on PTACs/P3HT blends with large open-circuit voltage

摘要

Four D-A polymers alternated between 3,4,9,10-tetra(n-alkoxy-carbonyl)-perylenes (PTACs) and thio-phene derivatives (TT and BDT) in backbones were synthesized under Stille coupling conditions. Their structures were unambiguously verified by ~1H NMR and elemental analysis. These polymers showed high-lying LUMO energy levels of about -3.50 eV due to the less electron deficient characteristics of PTACs units. All-polymer solar cells based on these PTAC-based polymers as acceptor and P3HT as donor have been fabricated. With annealing at 100 °C for 15 min, P4/P3HT blends demonstrated a power conversion efficiency of up to 1.10% with a short circuit current (J_(SC)) of 2.9 mA/cm~2, an open circuit voltage (V_(OC)) 0.92 V, and a fill factor (FF) of 0.40, illustrating that PTACs are attractive candidates for solar cells.