Here, we present measurements of the intrinsic response time of metal graphene metal photodetectors with monolayer graphene using an optical correlation technique with ultrashort laser pulses. We obtain a response time of 2.1 ps that is mainly given by the short lifetime of the photogenerated carriers.
SWNTs can be considered as one rolled-up graphene sheet, while MWNTs are concentric tubes separated by about 0.34 nm of two or more rolled-up graphene sheets. SWNTs have very unique electrical properties, depending on the chirality of the wrap, and they can behave as either metals or semiconductors [ 11 , 12 ]. Figure 3. In situ electrical and optical characterization of ML-graphene on paper. (a) Variation of the sheet resistance of ML-graphene during the intercalation process as the bias voltage between the graphene electrodes varies from 0 to 4 V. The inset shows the schematic representation of the four-point measurement system.
single and few-layer graphene sheets on metal substrates, e.g. Ni, Ru, and Cu.6–9,49 Plasma enhanced CVD (PECVD) is able to grow single-layer graphene with high throughput at shorter reaction time and lower deposition temperature compared to the CVD process.87 Besides, graphitization of carbon-containing
Feb 23, 2012 · Photoconductivity of biased graphene . ... graphene sheets with length and width of 6 ... Unterrainer, K. & Mueller, T. Intrinsic Response Time of Graphene . Photodetectors. Nano Letters 11, ... The intrinsic n-type edge of the graphene sheet is experimentally observed on pristine devices, where a scaling law of increased doping with a reduction in dimension should exist. Multiple pristine graphene sheets of varying dimension are fabricated on two separate substrates (defined as a batch).