| 초록 |
In this research, we study for efficient charge extraction via electrode interfacial layers for high performance vertical and lateral organic photovoltaics(OPVs). We demonstrate that the photo-current and the power conversion efficiency of organic photovoltaic cells OPVs can be maximized by the oriented interfacial dipoles within the water soluble conjugated polyelectrolytes (CPE) layer. We synthesized cationic and anionic conjugated polyelectrolytes and then we employed them as an electron extraction layer in polymer photovoltaic cells. In contrast to the conventional belief, both the anionic and cationic CPE layers improved the electron injection and extraction at the cathode interface, which leads to highly efficient OPVs irrespective of the ionic groups of polyelectrolytes. Therefore, we investigated the role of the conjugated polyelectrolytes as the charge extraction layer by using surface photoelectron spectroscopy. We applied external electric field on the device which employ CPE interfacial layer to make that CPE interfacial layer has a net internal electric field without external bias. |
