Germany successfully measured the photoelectric behavior of graphene
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December 30 18:05:18, 2018
According to a report by the American Physicist Network on January 31, a photodetector made of graphene can process and direct photoelectric signals very quickly, and photo-stimulated graphene can generate photocurrent within one picosecond, but There has not been a viable method before to measure these processes in graphene. Now, scientists at the Technical University of Munich in Germany have developed a method to measure the time dynamics of ultra-high-speed photocurrent in graphene by time. In addition, they also found that graphene can emit terahertz radiation. The relevant research report was published in the journal Nature Communication recently published. Graphene really fascinates scientists because of its extremely high conductivity, which is very useful in the development of photodetectors. These electronic components can detect radiation and convert it into electrical signals, thus inspiring scientists to use graphene to design ultra-high-speed photodetectors. However, the photoelectric behavior time dynamics in graphene is currently not measurable, for example, it is difficult to measure how long it takes to electrically stimulate graphene until it produces photocurrent. Physicists at the Technical University of Munich have developed a method that first increases the time resolution of the measured photocurrent in graphene to the picosecond range, which allows them to detect pulses of only a few picoseconds. The core of the photodetector is the free-suspended graphene that is incorporated into the circuit through metal contacts. The temporal dynamics of the photocurrent can be measured by a method called "coplanar stripline", which is evaluated by a special time-resolved laser spectroscopy program, known as pump detection technology. The laser pulse excites the electrons in the graphene, and the dynamics of this process are monitored by another laser. With this technology, physicists can accurately monitor how the photocurrent in graphene is generated. The scientists also used the new method to further observe that when graphene is stimulated by light, it can emit radiation in the terahertz (THz) range, which is between infrared light and microwave radiation in the electromagnetic spectrum. What is special about terahertz radiation is that it shows the shared properties of adjacent frequency ranges, which can be bundled like particles and penetrate the characteristics of electromagnetic waves. This makes it an ideal candidate for material testing and can be applied to specific medical fields.