| 초록 |
Organic photovoltaic cells (OPVs) are known to be promising renewable energy in the future, and since carbon sources are depleted, efforts to increase power conversion efficiency are needed. Proper molecular aggregation in the blended active layer is necessary for optimal film morphology and high performance in OPVs, from which charge transporting ability, which is related to short-circuit current, could be improved. Molecular packing and aggregation type (H- and J-type) can be controlled by changing alkyl side-chain of the molecules. In this work, non-fullerene small molecule (NFSM) acceptors were designed to have various alkyl side-chains at the ends. We measured electrochemical and optical properties of the each molecule and the film morphologies of the blend layers were also studied. Finally, the OPV devices were fabricated by blending with proper polymer donors and the relationship between the molecular structure, aggregation, and device performance was investigated. |
