| 초록 |
The power-conversion efficiency of photovoltaic device(PV) depends on photo-absorption process which generates excitons. For this reason, much research has been focused on synthesizing low bandgap materials and characterizing the PV device performance by blending low bandgap donors with fullerene derivatives. However, little attention has been paid to develop low bandgap acceptors. In this research, the core-extended perylene bisimides(PBI) derivatives have been synthesized and characterized. Thermal adducts of PBI and 1,2,4-triazoline-3,5-dione were spontaneously oxidized to yield fully pi-conjugated fused polybenzenes. They absorbed light from visible to NIR up to 850nm and have high stable and reversible redox processes from a CV analysis. The PBI derivatives were polymerized by Ullmann reaction to improve electronic properties and film application. With new acceptors, PV performances were measured by blending them with several polymer donors and compared with a bilayered PV device. |
