Substrate Dependent Molecular Orientation in Thin Films of Bisazomethine Dye Studied by Metastable Atom Electron Spectroscopy and Ultraviolet Photoelectron Spectroscopy

Abstract

Metastable atom electron spectroscopy and ultraviolet photoelectron spectroscopy were used to characterize orientation of bisazomethine dye molecules (DE2) in thin films deposited on graphite and ITO. We found that the molecular orientation of DE2 in multilayers is largely different on these substrates. On graphite, the molecules lie flat in a monolayer and become standing up with increasing the film thickness, while on ITO they lie nearly flat independent of the film thickness.

Keywords:

• bisazomethine dye
• metastable atom electron spectroscopy
• molecular orientation
• ultraviolet photoelectron spectroscopy
• vacuum deposited thin film

Acknowledgments

The present work was partly supported by 21st Century COE Program (Frontiers of Super Functionality Organic Devices) and a Grant-in-Aid for Young Scientists (A) from MEXT.