| 초록 |
In this study, we designed and synthesized a series of molecular acceptors with A-D-A′-D-A structure for organic phtovoltaics (OPV). Four synthesized acceptors are based on indacenodithienothiophene (IDTT) as donor unit (D), diketopyrrolo-pyrrole (DPP) or isoindigo (IID) as electron deficient core unit (A’) and INCN or F-INCN as end groups (A), respectively. The characteristics of the acceptors were analyzed through experiments such as UV-vis spectroscopy, cyclic voltammetry and density functional theory. To investigate photovoltaic performances, we fabricated and optimized a inverted device structure with [ITO/ZnO/PBDB-T:Acceptor/MoO3/Ag]. The power conversion efficiency (PCE) of molecular acceptor with IID and FINCN (4F-ITIC-IID-ITIC) exhibited highest value of 6.20 % than those of the other acceptors. To explain the reason for these device results, we also performed morphology analysis using 2D-Grazing incidence X-ray diffraction(2D-GIXD) and atomic force microscope measurements. |
