The electronic structure of a bi-layer hole extraction contact consisting of nickel oxide (NiOx) and molybdenum trioxide (MoO3) is determined via ultraviolet and X-ray photoemission spectroscopy. The bi-layer presents ideal energetics for the extraction of holes and suppression of carrier recombination at the interface. The application of the NiOx/MoO 3 bi-layer as the anode of organic bulk heterojunction solar cells based on PCDTBT/PC71BM leads to improved device performance, which is explained by an intricate charge transfer process across the interface. Nickel oxide/molybdenum oxide bi-layers enhance hole collection in organic photovoltaic devices. Device improvement in PCDTBT:PC71BM based solar cells is attributed to the electronic structure of the oxide interlayer. The electron blocking capability of NiOx is combined with the high work function of MoO3, which enable efficient coupling of the electrode to the hole transport level in the polymer.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics