Abstract
Electronic structures of donor-acceptor hetero-interfaces are crucial for performance of organic solar cell devices. In the present study, a well-defined organic molecular interface of pentacene single crystal and C60 overlayer is elucidated by x-ray and ultraviolet photoelectron spectroscopy (XPS and UPS) and photoelectron yield spectroscopy (PYS). An energy level diagram at this hetero-molecular contact in the “head-on” orientation is derived, which reveals the vacuum level alignment and flat-band conditions. [DOI: 10.1380/ejssnt.2015.59]
Highlights
Hetero-interfaces between organic materials have crucial importance for functionalities of organic electronic devices
A well-defined organic molecular interface of pentacene single crystal and C60 overlayer is elucidated by x-ray and ultraviolet photoelectron spectroscopy (XPS and UPS) and photoelectron yield spectroscopy (PYS)
Our group has succeeded in overcoming this problem to demonstrate the highest occupied states, valence band dispersion, and core levels of organic semiconductor single crystals by means of photoelectron yield spectroscopy (PYS) and laser-assisted photoelectron spectroscopy techniques [8,9,10]
Summary
Electronic Structures of a Well-Defined Organic Hetero-Interface: C60 on Pentacene Single Crystal∗. Masayuki Yamamoto Graduate School of Advanced Integration Science, Chiba University 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. Yasuo Nakayama† Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan, and Faculty of Engineering, Chiba University, Japan. Yuki Uragami and Hiroumi Kinjo Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. Hisao Ishii Center for Frontier Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan, and Graduate School of Advanced Integration Science and Faculty of Engineering, Chiba University, Japan (Received 24 December 2014; Accepted 9 February 2015; Published 28 February 2015). A well-defined organic molecular interface of pentacene single crystal and C60 overlayer is elucidated by x-ray and ultraviolet photoelectron spectroscopy (XPS and UPS) and photoelectron yield spectroscopy (PYS).
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