Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Doping graphene films via chemically mediated charge transfer | Ishikawa et al. Nanoscale Research Letters 2011 6 111 http content 6 1 111 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Doping graphene films via chemically mediated charge transfer Ryousuke Ishikawa1 2 Masashi Bando1 Yoshitaka Morimoto1 Adarsh Sandhu1 2 3 Abstract 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. Introduction Transparent conductive films TCFs are a class of extremely important components of modern technology for applications such as optical devices and solar energy utilization 1 . Indium tin oxide ITO is the most widely used material as TCFs however the high cost and the limited supply of indium a rare-earth metal have become a serious concern. Thus alternative materials with high transparency and low electrical sheet resistance comparable to ITO are required. During the last decade a number of materials such as conducting polymer films 2 or nanostructured thin films 3 have been .
