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This 10,000-magnification picture shows that an electronic device has carved rugged “mountain peaks†and “valleysâ€. After the molybdenum disulfide is laid on it, it forms a kind of variable energy gap. Intraocular lens.
Recently, a scientific team at Stanford University in the United States for the first time passed the crystal lattice of molybdenum disulfide to "pull" a semiconductor whose energy gap can be changed. Using this semiconductor, scientists are expected to create solar cells that can absorb more light energy.
Many electronic products are inseparable from semiconductors. In order for semiconductors to be used by humans, engineers must accurately know how much energy the electrons consume when passing through a crystal lattice. This kind of energy measurement is called energy gap, which can help scientists decide which material is more suitable for performing certain electronic tasks.
The molybdenum disulfide used by the research team is a rock crystal. The material itself is common, but Zheng Xiaolin, a mechanical engineer at Stanford University, and physicist Harry Manoharan, have demonstrated that the arrangement of molybdenum disulfide crystal lattices gives it unique electronic properties.
Molybdenum disulfide is a substance with a single-layered atomic structure: a molybdenum atom connects two sulfur atoms, and this triangular crystal lattice repeatedly repeats on the horizontal plane to form a paper-like structure. Molybdenum disulfide natural rock is the result of a stack of multiple such monolayer structures. "From a mechanical engineering point of view, a single layer of molybdenum disulfide is very attractive, because its crystal lattice can be greatly stretched without breaking." Zheng Xiaolin said.
According to the official website of Stanford University, the research team carved rugged "mountain peaks" and "valleys" on the chip, covered with a single-layered atomic structure of molybdenum disulfide, and then extended the crystal lattice of molybdenum disulfide to "Valley bottom" or "mountain peak." This stretching changes the energy required to move the electrons in the molybdenum disulfide crystal lattice and creates an artificial crystal with a variable energy gap.
Since 2010, the British scientists Andre Gaim and Konstantin Novoserove won the Nobel Prize for the single-layer carbon atom structure of graphene, scientists have been very interested in the material of the monolayer atomic structure. In 2012, scientists from the Massachusetts Institute of Technology extended the crystal lattice of molybdenum disulfide in a simulation experiment and theoretically changed the energy gap of molybdenum disulfide. The Stanford University scientific research team actually achieved the extension of the molybdenum disulfide crystal lattice.
Researchers believe that this experiment laid the foundation for further scientific innovation in the structure of artificial crystals. Manoharan believes that this research result will have a wide range of impact on sensors, solar energy and other fields. As far as the solar field is concerned, since this artificial crystal structure is sensitive to a wider spectrum of light, it has the potential for producing more efficient solar cells. (Reporter Liu Yuanyuan)
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