For large-scale and high-throughput production of organic solar cells (OSCs), liquid processing of the functional layers is desired. We demonstrate inverted bulk-heterojunction organic solar cells (OSCs) with a sol-gel derived V 2O 5 hole-extraction-layer on top of the active organic layer. The V 2O 5 layers are prepared in ambient air using Vanadium(V)-oxitriisopropoxide as precursor. Without any post-annealing or plasma treatment, a high work function of the V 2O 5 layers is confirmed by both Kelvin probe analysis and ultraviolet photoelectron spectroscopy (UPS). Using UPS and inverse photoelectron spectroscopy (IPES), we show that the electronic structure of the solution processed V 2O 5 layers is similar to that of thermally evaporated V 2O 5 layers which have been exposed to ambient air. Optimization of the sol gel process leads to inverted OSCs with solution based V 2O 5 layers that show power conversion efficiencies similar to that of control devices with V 2O 5 layers prepared in high-vacuum.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- high work-function materials
- inverted organic solar cells
- solution processed metal oxide
- vanadium oxide