Large Scale Graphene Devices and Membranes
Photocurrent Microscopy and Applications
Carbon Nanotubes as Optical Antennas
In recent years, understanding physical and chemical properties of nanoscale materials such as carbon nanotubes, nanocrystals and nanowires has been at the center of intense research efforts, because of their unique scientific and application opportunities. These nanoscale structures often exhibit electrical and optical properties comparable and, in some cases superior, to traditional semiconductors while maintaining the processing advantages of organic materials. Moreover, the key electrical and optical parameters can be tuned simply by changing their size thus providing a rational route to optimize the device performances within the same material configuration.
Several electrical and optoelectronic devices that demonstrate the potential of nanoscale structures have been realized thus far, including various logic gates, highly efficient photovoltaic cells, electrically and optically driven lasers, and quantum optical light sources. The performance of many of these devices is determined by the complex interplay between multiple processes occurring in differing length and time scales. For instance, the operation of a photovoltaic cell involves the efficient photon absorption, separation of an electron and a hole, charge transport through the nanostructures and at the interface, charge trapping, and energy relaxation. The design and optimization of electronic and optoelectronic devices therefore requires an experimental tool to investigate these complex, multi-scale processes at the system-wide level.
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