The Energy Level Alignment at the CH3NH3PbI3/Pentacene Interface was resolved experimentally.
The downward band bending and the dipole found at the pentacene side would favorably drive holes away from the interface into pentacene.
A ∼0.7 eV offset between pentacene HOMO and CH3NH3PbI3 VBM would be in favor of hole transfer whereas a ∼1.35 eV offset between pentacene LUMO and CH3NH3PbI3 CBM should efficiently block the unwanted electron transfer from perovskite to pentacene.
Pentacene could be a viable hole transfer material candidate on perovskite to be explored in perovskite devices.