Spanish and U.S. scientists have collaborated on a graphene-based photodetector converter that converts light into electrical signals in less than 50 femtoseconds (one-trillionth of a second) almost Approaching the limit of photoelectric conversion speed will greatly boost the development in many fields.

Efficient photoelectric conversion technology, because it can make the information carried by light into electrical signals that can be processed in electronic circuits plays an important role in many key technologies ranging from cameras to solar cells and is also important for data communications applications support. Although graphene is a material with very high photoelectric conversion efficiency, scientists had no idea how fast it responded to ultra-short light pulses.

Now, by the Spanish Institute of Photonics researcher Professor Frank Coppense, Institute of Advanced Catalonian Nilk Van Hurst, Massachusetts Institute of Technology Pablo Galileo - Gehry, and a research team led by Liu Jinning, a professor of physics at the University of California, Riverside, have developed this graphene-based photodetector converter, which converts light in less than 50 femtoseconds Into electricity, the photoelectric conversion rate pushed 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-sensitive electronic readout. Researcher Claes Jan Thiel said: "The unique thing about this experiment is the perfect combination of ultrafast pulse forming technology with graphene electronics derived from single-molecule ultrafast photonics, The non-linear photothermal-thermoelectric response of graphene allows scientists to convert light into electrical signals in such a short period of time. "

The researchers said that due to the ultra-fast and ultra-efficient association of all the conduction band carriers in graphene, it is possible to quickly create a photovoltage in graphene. This correlation allows them to quickly create an electronic distribution using an ever-increasing electron temperature. As a result, energy absorbed from the light can be efficiently and quickly converted into electronic heat. Subsequently, at the junction of two graphene regions with two different doping, the heat of the electrons is converted into a voltage. Experimental results show that this photothermal effect appears almost simultaneously, and the absorbed light can be quickly converted into electrical signals.

The researchers said the latest research opens up a new pathway to ultrafast photoconversion. Coppenz emphasizes: "Graphene photodetectors have amazing properties that can be applied in many areas."

The detector is like an eye. The photoelectric conversion device is like the photoreceptor cell in the eye. The sensitivity of the cell determines the appearance of the world seen by the eye and determines the brain's understanding of the world. For photodetectors, especially those requiring precision measurements, even milli-second errors can yield the slightest margin of error. This study once again brings surprises to graphene, pushing the photoelectric conversion speed to the limit, so as to obtain the fastest response, so as to minimize the interference factor so that we can see clearly from the particle world to cosmic space. More accurate and more intelligible.

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