| 초록 |
We developed wide-bandgap titanium oxide (TiOX) electron transport layer to increase the photostability of organic photovoltaics (OPVs), by suppressing the photocatalytic effect from the metal oxide. When the light with sufficient energy is irradiated onto the metal oxide layer, the photocatalytic effect occurs. Then, the electrons and holes react with the absorbed oxygen or moisture to creating radicals which can attack the photoactive materials to degrade the device performance. Here, we developed a sol-gel processed TiOX with 324 nm of bandgap, which was not activated by the incident light on the device. As a result, we achieved 1000 h photostability of OPVs (power conversion efficiency drops 5% after 1000 h under AM 1.5G 1 sun illumination). |
