According to the report of the “Daily Science†website of the United States on the 14th, Spanish and U.S. scientists have collaborated to develop a graphene-based photodetector converter, which can be used in less than 50 femtoseconds (one trillionth of a second). During the period of time, the light is converted into an electrical signal, which is close to the limit of the photoelectric conversion speed, and will greatly promote the development of multiple fields.
High-efficiency photoelectric conversion technology, because it can transform the information carried by light into electrical signals that can be processed in electronic circuits, plays an important role in many key technical fields, from cameras to solar cells, and is also important for data communication applications. support. Although graphene is a material that has extremely high photoelectric conversion efficiency, scientists had previously not known how fast it responded to ultrashort pulses of light.
Now, Professor Frank Koppes, a researcher at the Spanish Institute of Photonics, Nierk van Hearst of the Institute for Advanced Studies in Catalonia, and Pablo Gallilo at the Massachusetts Institute of Technology - Heyero, and the research team led by Professor Liu Jinning of the University of California, Riverside Physics Department, developed the graphene-based photodetector converter, which can convert light in less than 50 femtoseconds. Converted into electricity, pushing the photoelectric conversion rate to the limit. The latest research has been published in the recently published "Nature Nanotechnology" magazine.
To do this, researchers used ultra-fast pulsed laser excitation and ultra-high-sensitivity electronic readout methods. Researcher Klaas-Yan Tell said: "The uniqueness of this experiment is that it combines the ultra-fast pulse forming technology obtained from single-molecule ultrafast photonics with graphene electronic technology. The nonlinear photo-thermoelectric reaction of graphene enables scientists to convert light into electrical signals in such a short time."
The researchers say that because of the ultrafast and ultra-efficient relationship between all the conduction band carriers in graphene, it is possible to rapidly produce photovoltages in graphene. This correlation allows them to use an evolving electron temperature to quickly create an electron distribution. As a result, energy absorbed from light can be efficiently and quickly converted into electron heat. Subsequently, at the junction of the two graphene regions with two different dopings, the heat of the electrons is converted into a voltage. The experimental results show that this photothermoelectric effect occurs almost at the same time, and the absorbed light can be quickly converted into an electrical signal.
The researchers said that the latest research opens a new path to ultra-fast photoelectric conversion. Koppens emphasized: “Graphene photodetectors have amazing performance and can be applied in many fields.†(Reporter Liu Xia)
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