Organic–Organic Heterojunction Interfaces: Effect of Molecular Orientation

• DOI: 10.1002/adfm.201000902
• Publication Date: 2010-12-08T07:56:21Z
• Authors: Wei Chen; Dong‐Chen Qi; Han Huang; Xingyu Gao; Andrew T. S. Wee
• Keywords: Organic semiconductor; Organic Electronics; Ambipolar diffusion

Abstract Organic–organic heterojunctions (OOHs) are critical features in organic light‐emitting diodes, ambipolar field‐effect transistors and solar cells, which fundamental building blocks low‐cost, large‐scale, flexible electronics. Due to the highly anisotropic nature of π‐conjugated molecules, molecular orientation thin films can significantly affect device performance, such as light absorption charge‐carrier transport, well energy level alignment at OOH interfaces. This Feature Article highlights recent progress understanding interface energetics small molecule interfaces, focusing on characterization fabrication with well‐defined orientations using a combination situ low‐temperature scanning tunneling microscopy, synchrotron‐based high‐resolution ultraviolet photoelectron spectroscopy near‐edge X‐ray fine structure measurements. The dependent alignments interfaces will be discussed detail.