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Journals and Conferences
Being an atomically thin material, graphene is known to be extremely susceptible to its environment, including defects and phonons in the substrate on which it is placed as well as gas molecules that surround it. Thus, any device design using graphene has to take into consideration all surrounding components, and device performance needs to be evaluated in… (More)
We observed THz radiation from the graphene-coated InP (100) surface and found the drastic change of the waveforms of THz radiation with time, which cannot be explained by the simple absorption of graphene.
In this study, the properties of optically excited silicon were investigated using terahertz time-domain spectroscopy (THz-TDS). The surface was illuminated with 365-nm ultraviolet (UV) light to excite charge carriers, and properties such as conductivity, charge carrier density and mobility were evaluated. The illumination effect significantly changed the… (More)
We investigate surface recombination of photoexcited carriers at silicon surface by terahertz time-domain spectroscopy (THz-TDS). The surface is illuminated at 365 nm UV laser, and evaluates the surface recombination velocity (SRV). The values of SRV observed on silicon surface strongly reduce under illumination.