Ishikawa Ryousuke, Bando Masashi, Morimoto Yoshitaka, Sandhu Adarsh
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552, Japan.
Nanoscale Res Lett. 2011 Jan 31;6(1):111. doi: 10.1186/1556-276X-6-111.
Transparent conductive films (TCFs) are critical components of a myriad of technologies including flat panel displays, light-emitting diodes, and solar cells. Graphene-based TCFs have attracted a lot of attention because of their high electrical conductivity, transparency, and low cost. Carrier doping of graphene would potentially improve the properties of graphene-based TCFs for practical industrial applications. However, controlling the carrier type and concentration of dopants in graphene films is challenging, especially for the synthesis of p-type films. In this article, a new method for doping graphene using the conjugated organic molecule, tetracyanoquinodimethane (TCNQ), is described. Notably, TCNQ is well known as a powerful electron accepter and is expected to favor electron transfer from graphene into TCNQ molecules, thereby leading to p-type doping of graphene films. Small amounts of TCNQ drastically improved the resistivity without degradation of optical transparency. Our carrier doping method based on charge transfer has a huge potential for graphene-based TCFs.
透明导电薄膜（TCFs）是众多技术的关键组件，包括平板显示器、发光二极管和太阳能电池。基于石墨烯的透明导电薄膜因其高导电性、透明度和低成本而备受关注。石墨烯的载流子掺杂可能会改善基于石墨烯的透明导电薄膜的性能，以用于实际工业应用。然而，控制石墨烯薄膜中掺杂剂的载流子类型和浓度具有挑战性，尤其是对于p型薄膜的合成。在本文中，描述了一种使用共轭有机分子四氰基对苯二醌二甲烷（TCNQ）对石墨烯进行掺杂的新方法。值得注意的是，TCNQ是一种众所周知的强电子受体，预计它有利于电子从石墨烯转移到TCNQ分子中，从而导致石墨烯薄膜的p型掺杂。少量的TCNQ显著提高了电阻率，而不会降低光学透明度。我们基于电荷转移的载流子掺杂方法对于基于石墨烯的透明导电薄膜具有巨大潜力。
