Electron Transport in Bathocuproine Interlayer in
Organic Semiconductor Devices
- Publication date
- Publisher
Abstract
When
a thin layer of bathocuproine (BCP) is inserted between the
metal electrode and the organic layer of the organic semiconductor
device, the electron injection/collection efficiency at the interface
is significantly improved. However, the mechanism of electron transport
through the BCP layer has not been clarified yet. In this study, we
directly observed the unoccupied electronic states of the Ag/BCP interface
using low-energy inverse photoemission spectroscopy. The result shows
that Ag strongly interacts with the BCP molecule and the lowest unoccupied
molecular orbital (LUMO) level of the Ag-BCP complex aligns with the
Fermi level, indicating that the electron transport occurs through
the LUMO level of the complex. With the aid of DFT calculation, we
identify the reaction product