| 초록 |
Organic solar cells(OSCs) are considered a promising candidates for renewable clean energy sources. The high efficiency OSCs at present use the blend of fullerene derivatives acceptor and low band gap donor polymers. Recently, however, the acceptor's synthetic scalability and stability problem of the device are reported.To overcome these drawbacks, non-fullerene OSCs should be explored. To achieve high efficiency non-fullerene OSCs, we introduced F atoms onto the polymer backbone. Comparison of their properties to non-fluorinated polymers shows that backbone fluorination leads to an increase in the polymer ionization potential without a significant change in optical band gap. Fluorination also results in an enhanced tendency to aggregate in solution, which is ascribed to a more co-planar backbone on the basis of DFT calculations. We believe that fluorination of donor polymer will optimize the solid-state packing and performance in a range of optoelectronic devices. |
