Controlling Properties of Graphene Devices through Surface Chemistry
George Nazin, Chemistry
Organic semiconductors have received a great deal of attention due to their potential for fabrication of lightweight, large-area, and low-cost solar cells. One important issue for the commercial viability of organic solar cells is the cost-efficient fabrication of transparent, conducting electrodes, which are required for the light to be able to reach the active area of the cell. Currently, the materials available for fabrication of transparent electrodes are either too expensive or have suboptimal conductivities. A nazin3_0promising novel transparent electronic material is graphene which has exceptionally high charge carrier mobility. We are investigating the routes to chemical manipulation of graphene bandstructure, which is important for fabrication of cells with efficient collection of photo-generated charge carriers.
The undergraduate student involved in the project will participate in the studies of graphene device doping via surface chemistry methods. The student will be trained (under the guidance of a graduate student) in the following techniques: optical spectroscopic characterization of graphene, fabrication of graphene devices using e-beam lithography, vacuum-based graphene surface chemical modification, electrical characterization of the graphene devices, and investigations of the device’s internal band-structure profiles using scanning photocurrent and scanning gate microscopies.