| 초록 |
The performance of polymer solar cells based on soluble polythiophene and fullerene has been well optimized through finding of critical compositions, annealing conditions (temperature and time), and solvents. However, the influence of long time annealing has been rarely reported. Here we report the effect of long time device annealing on the performance of polymer solar cells with the Ca/Al top electrode. For this study, blend films of regioregular poly(3-hexylthiophene) and soluble fullerene were employed, while the annealing time was extended up to 300 min at 140 0C. In order to understand the effect of long time annealing on the device performance, the surface morphology of blend films was examined using atomic force microscopy and field emission-scanning electron microscopy. |
