Photoemission and Inverse Photoemission Studies on Organic Semiconductor Thin Films (INTERFACE SCIENCE-Molecular Aggregates)

Abstract

Ultraviolet photoemission (PE) and inverse photoemission (IPE) spectra were measured for evaporated thin films of perylene-3, 4, 9, 10-tetracarboxylic dianhydride (PTCDA) and N, N'-dimethylperylene-3, 4, 9, 10- bis(dicarboximide) (DM-PBDCI), the latter known as an n-type organic semiconductor and the semiconducting nature of the former still unidentified. The electronic structure around the energy gap, obtained from the combination of PE and IPE spectra observed, turns out to be almost common between the two compounds, indicating that PTCDA could be grouped into the n-type semiconductor.