| 초록 |
The small-molecule dyes based on dialkyl viologen with different alkyl chains (C4, C6, and C12) have been applied as the interlayer for polymer solar cells. The power conversion efficiency of the device with V-alkyl-OTs as the interlayers were 8.1 (C4), 8.3 (C6), and 8.6% (C12), respectively. These values are better than the device with pristine ZnO (7.6%) due to the formation of the interface dipole at the cathode interface by the thin layer of V- alkyl-OTs. Also, we found that the PCEs of the PSCs depend on the alkyl chain length of interlayer materials because a longer alkyl chain induces a larger interface dipole. From the results, a longer alkyl chain induces a larger interface dipole, and the enhancement of the PCE is strongly related to alkyl chain length. |
