Tuning the alignment of pentacene on copper substrate by annealing-assistant surface functionalization

• 作者: Bi-Yun Shi Cong-Rong Lu Hai-Peng Xie Qiao-Jun Cao Qun Wang Shuang Wen Wei-Dong Dou Yongli Gao
• 来源期刊: 中国物理B（英文版）
• 关键词: ultra-thin film molecular alignment metal substrate interfacial tuning
• 年，卷（期）: 2020,（7）
• 页码范围: 481-488
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab8da2

摘要

Controlling the alignment and packing structure of organic molecules on solid substrate surfaces at molecule level is essential to develop high-performance organic thin film (OTF) devices.Pentacene,which is a typical p-type semiconductor material usually adopts lying-down geometry on metal substrates owning to π-d coupling between pentacene and metal substrates.However,in this study,we found that pentacene molecules can be adsorbed on an anneal-treated Cu (111)surface with their long axis perpendicular to substrate surface.Highly ordered single-layer pentacene film with stand-up molecular geometry was achieved on this substrate.It was found that the functionalization of Cu surface with C=O groups due to annealing treatment should be accounted for standing-up geometry of pentacene on Cu substrate.This observation shed light on the tuning of the alignment and packing structure of organic molecules.