| 초록 |
Organic photovoltaics (OPVs) have been of current interest for a low-cost, scalable and environmental-friendly solar energy conversion. Main improvement of the photovoltaic efficiencies of the OPVs can be achieved by the development of photoactive materials which is typically a blend of a polymer electron donor and a small-molecule electron acceptor. In this talk, random conjugated copolymers based on 5,6-difluoro-2,1,3-benzothiadiazole unit are presented in order to achieve high power conversion efficiency. The incorporation of the fluorinated bithiophene monomer unit resulted in an increase in the open circuit voltage and photocurrent density which enhanced the photovoltaic performance compared to the analogues with non-fluorinated thiophenes. An externally certified power conversion efficiency (PCE) over 12.0% has been obtained for an optimized OPV devices which is the highest value among Polymer:PCBM photoactive layer based OPV devices. |
