Enhanced organic photovoltaic cells with MoO_x nanorods as a hole transfer layer

ABSTRACT

Molybdenum oxide(MoOx) nanorods have been used as a hole transfer layer(HTL) for an organic photovoltaic(OPV) cell because it has a bandgap similar to that of PEDOT:PSS. The structure of OPV is a fluorine-doped tin oxide(FTO) / MoO_x nanorod / P3HT:PCBM / ZnO / Ag. The morphology of the MoO_x layer was controlled by the hydrothermal reaction time and the concentration of the precursor. The photoelectric conversion efficiency(PCE) was affected by widening the hole transfer surface between the HTL and the active layer. A device with 0.24 wt% MoO_x precursor and a 20-min reaction time had a highest efficiency of 2.7%.

KEYWORDS:

• Hole transfer layer
• molybdenum oxides
• nanorod
• organic photovoltaic
• power conversion efficiency

Funding

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT and Future Planning (NRF-2014R1A2A2A04004950).