Xu Zeyang, Chen Xiaosong, Zhang Suna, Wu Kunjie, Li Hongwei, Meng Yancheng, Li Liqiang
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China and Advanced Nano-materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, China.
Advanced Nano-materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, China.
Phys Chem Chem Phys. 2016 May 11;18(19):13209-15. doi: 10.1039/c6cp00756b.
Electrode materials and geometry play a crucial role in the charge injection efficiency in organic transistors. Reduced graphene oxide (RGO) electrodes show good compatibility with an organic semiconductor from the standpoint of energy levels and ordered growth of the organic semiconductor, both of which are favourable for charge injection. However, the wide electrode edge (>10 nm) in commonly-used RGO electrodes is generally detrimental to charge injection. In this study, ultrathin (about 3 nm) RGO electrodes are fabricated via a covalency-based assembly strategy, which has advantages such as robustness against solvents, high conductivity, transparency, and easy scaling-up. More remarkably, the ultrathin electrode fabricated in this study has a narrow edge, which may facilitate the diffusion and assembly of organic semiconductors and thus form a uniform semiconductor film across the electrode/channel junction area. As a result, the minimized electrode edge may significantly improve the charge injection in organic transistors compared with thick electrodes.
电极材料和几何形状在有机晶体管的电荷注入效率中起着至关重要的作用。从能级和有机半导体的有序生长角度来看，还原氧化石墨烯（RGO）电极与有机半导体表现出良好的兼容性，这两者都有利于电荷注入。然而，常用的RGO电极中较宽的电极边缘（>10 nm）通常对电荷注入不利。在本研究中，通过基于共价键的组装策略制备了超薄（约3 nm）的RGO电极，该策略具有抗溶剂性强、高导电性、透明性以及易于放大等优点。更值得注意的是，本研究中制备的超薄电极具有较窄的边缘，这可能有助于有机半导体的扩散和组装，从而在电极/沟道结区域形成均匀的半导体薄膜。因此，与厚电极相比，最小化的电极边缘可能会显著提高有机晶体管中的电荷注入。
