Fabrication of Graphene by Chemical Methods and Its Application to Organic Semiconductor Devices

Abstract

In this article, the method to fabricate a highly conductive graphene thilm from natural graphite powder through oxidation, exfoli-ation, deposition and reduction processes will be presented. Subsequently, the application of the graphene thilm to the electrodes of organic thin lm devices will be introduced. Chemically oxidized graphite powder was dispersed in water, and it was exfoliated by sonication or by repeated centrifugation and washing processes to obtain graphene oxide (GO). Successively a Glm was fabricated by coating a substrate with the GO solution, and it was chemically and thermally reduced to produce a highly conductive graphenêlm. Operation of organic thilm solar cells, which make use of the graphenêlms as their transparent electrodes, has been demonstrated. To date, the power-conversion ratio as high as 1 is achieved. Good operating performance of organic thileld-eŠect transistors, which have graphene source/drain electrodes, is also demonstrated.