[TuP3H] H. Flexible materials

[TuP3H-07] Work Function Tuning of Gold-Platinum Electrodes Toward Organic Electronic Device Applications

〇Shotaro Fujiki¹, Mituki Okamoto¹, Yih-Ren Chang¹, Yoshiaki Hattori¹, Masatoshi Kitamura¹ (1. Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University (Japan))

Organic electronic devices have attracted considerable attention owing to their potential for flexible and low-cost applications. For such devices, the selection of electrode materials is important. In organic TFTs, gold is often used as an electrode material. However, the price of gold has increased significantly in recent years. In this study, we
attempted to tune the work function using Au/Pt bilayer electrodes with a thin Au overlayer. In addition, we investigated the work function of Au/Pt electrodes modified with a molecular layer The work function of a substrate with a Au/Pt bilayer electrodes with a thin Au overlayer of 0.1 to 1.5 nm has been investigated. The work function of the Au/Pt electrode were between those of Pt and Au, and changed from 4.92 to 4.76 eV with increasing Au thickness. In addition, surface treatment with pentafluorobenzenethiol (PFBT) was performed. For Au/Pt/Ti layers, PFBT treatment leads to an increase in the work function from 4.8 to 5.2 eV. The shift indicates the formation of a PFBT monolayer on the Au/Pt surface despite the thin Au thickness of 0.5 nm.