| 초록 |
In the field of orgnic photovoltaic cells (OPVs), the electron transport(ETL) layer enhances power conversion efficeiency (PCE) through the incorporation of cathode interfacial layers. Here, we introduce [bis-4,6-(3,5-di-4-pyridylphenyl)-2-methylpyrimidine] (B4PyMPM) as an n-type buffer layer consisting of self-organized layer with a horizontal configuration in bulk hetero-junction(BHJ) OPVs. It is demonstrated that self-organization of this B4PyMPM compound in which molecules adopt a face to face orientation parallel to the organic semiconducting substrate induces a large local interfacial electric field that results in a significant enhancement of exciton dissociation. It is expected that the device using B4PyMPM as ETL layers has a significantly high short circuit current and good fill factor due to the stability of chemical reaction and low contact resistance leading to high power conversion efficiency. |
