| 초록 |
Transition metal oxide (TMO) thin films have been exploited as interlayers for the charge extraction between electrode and active layer in organic photovoltaics (OPV). Especially, TMO-based interlayers on the graphene electrode have recently received much attention due to long-term stability compare with conventional type OPV. However, film deposition process of TMO thin layers has been generally prepared via thermal evaporation or sputtering under vacuum because of hydrophobic surface of graphene. In this study, we present a novel means to create thin TMO monolayer on graphene surface by employing bifunctional biotemplates with solution process, whereby nondestructive functionalization of the graphene and uniform synthesis of TMO nanoparticles are concurrently achieved. As a result, the TMO interlayer exhibited a 20% higher photo-conversion efficiency compared with conventional PEDOT:PSS. Moreover, the TMO/PEDOT:PSS bilayer-based OPV device was achieved 61% improvement on PEDOT:PSS. |
