| 초록 |
The electron transporting layer (ETL) plays a vital role in the power conversion efficiency (PCE) of perovskite solar cells (PSCs). We have demonstrated the synthesis of ruthenium doped mesoporous TiO2 (Ru-TiO2) and their utility as ETLs for PSCs. The doping effects of Ru+4 on the electronic and photovoltaic properties of mesoporous TiO2 (mp-TiO2) have been investigated as well. The highest PCE of 18.94% was obtained with 0.1 M Ru-TiO2 PSCs exhibiting an open circuit voltage (VOC) of 1.128 V, current density (JSC) of 22.55 mAcm-2, and fill factor (FF) of 76.55 %, whereas the conventional mesoporous PSCs showed PCE=16.80 %, VOC=1.095 V, JSC =21.50 mAcm-2, and FF=70.01 %. Note that the 0.1 M Ru-TiO2 device shows high PCE with negligible hysteresis index, high reproducibility, and more than 100 days stability without encapsulation as compared to conventional mesoporous PSCs. |
