| 초록 |
Solar cells are in the spotlight as one of the eco-friendly energy. However, efficiency is still a problem for solar cells to be commercialized, so we used a D-A structure which can controls energy levels of polymers to formulate proper energy level of polymers. Difluorinated phenazine(DFPz) composed of butyl octyl alkyl chain was used as an accepter unit, and difference of performance was compared by using BDT and BDTT as a donor unit. As a result, polymer with thienyl group showed better performance than polymer with alkoxy group. The HOMO of BDTT-DFPz was measured lower than that of HOMO of BDT-DFPz, which resulted in increased Voc. FF were also improved, giving BDTT-DFPz better PCE. This was predicted to have expanded π conjugated structure due to the added thiophene, which may have improved the charge mobility. In summary, it was found that BDTT-DFPz showed 5.28% PCE, whereas BDT-DFPz showed 4.24% PCE. |
