| 초록 |
An efficient inverted organic photovoltaic cell has been fabricated by incorporating a zinc oxide (ZnO)/PFN series stacked structure as an electron-transporting layer. The PFN materials comprise three kinds of polymer backbone, poly[(9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-9,9-dihexylfluorene) (PFN), Poly[(9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt 4,7-thiophene) (PFN -T), and Poly[(9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt 4,7-dithienyl-2,1,3-benzothiadiazole) (PFN -TBT) are used. The power efficiency are investigated by comparison conventional and inverted structure. The PFN series improved electron collection efficiency in inverted devices, thereby reducing the leakage current and improving the device reliability. We found that by coating PFN based material onto the ZnO surface gained high power conversion efficiency of 9% (with a fill factor more than 60%) and the highest PCE (9,41%) among PFN series is achieved in PFN-TBT |
