| 초록 |
In this study, polymer donors used in active layer based on benzo[1,2-c:4,5-c']dithiophene-4,8-dione (BDD) were synthesized, which showed good efficiency as an accepting unit in the D-A type donor. We designed and synthesized PBDT-biBDD based on BDD unit and used it as a polymer donor. However, it shows moderate efficiency. The reason for this is that the intermolecular distortion has increased due to the interaction between BDD was introduced between BDD molecules. UV-vis absorption region was red-shifted as a change in the energy bandgap, resulting in complementary absorption with the non-fullerene acceptor material. The device of inverted structure (ITO/Zno/Polymer:IT-4F/MoO3/Ag) was produced to measure photoelectric properties. As a result, PBDT-biBDD_T showed PCE of 5.99% and PClBDT-biBDD_T 2.50%. Thus, this study has demonstrated that improving intermolecular correctness greatly helps to improve photoelectric properties. |
