Graphene electronic devices

Electronic devices based on graphene have been widely investigated in various application fields. Graphene has special electrical properties such as excellent carrier mobility, typical ambipolar behaviors, and a special energy band structure, which could be used in field effect transistors (FETs) and applied in radio frequency (RF) circuits, sensors, memories, and so on. Due to the broad spectrum absorption scope ranging from ultraviolet to far-infrared, it is possible for graphene to realize the ultrafast and ultrasensitive detection to the optical signals in the ultraviolet, visible, infrared even terahertz frequency wavelengths. Therefore, graphene-based photodetectors and solar cells have attracted much attention in recent years. Graphene also possesses the high transmittance and conductivity, which makes it widely used as transparent conductive electrodes applied in various optical and electrical devices. In addition, graphene could be used in nanoelectromechanical systems (NEMS) due to the special mechanical properties such as portable quality, ultrahardness and excellent Young’s modulus, etc. The chapter will introduce the electrical properties and the application of graphene in various electronic devices mentioned above.