| 초록 |
We designed and synthesized two quinoxaline-based small molecules with the intention of regulating the dipole moment in the molecule through the structural modification. The charactereics of two target molecules were investigated by utilizing two types of photovoltaic devices. Interestingly, the enhanced efficiency with good long-term stability of the devices was achieved from both devices, when the newly developed two materials were used as electron transporting layers (ETLs). This result can be attributed the efficient modulation of the work function of the electrode by controlling the interfacial dipole moment occurring at the interface. In addition, the addition of ETL can fine tune the overall energy levels of the device, which can trigger more facile electron injection and extraction process. Therefore, this study can offer meaningful insights in the structure-property relationships of comjugated molecules for developing organic ETL materials. |
