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The 10,000x magnification shows that the rugged "mountain" and "valley" are carved out of an electronic device, and the molybdenum disulfide laid on top of it stretches to form a structure that has a variable energy gap IOL
Recently, a research team at the Stanford University in the United States first "pulled" a semiconductor capable of varying energy gap by stretching the crystal lattice of molybdenum disulfide. Using this semiconductor, scientists are expected to create solar cells capable of absorbing more light energy.
Many electronic products are inseparable from the semiconductor. In order for the semiconductor to be used by humans, engineers must know exactly how much energy the electrons need to spend through the crystal lattice. This energy measurement is called energy gap, it can help scientists decide which kind of material is more suitable to perform some kind of electronic task.
The research team used molybdenum disulfide is a rock crystal. The material itself is common, but Zheng Xiaolin, a mechanical engineer at Stanford University, and physicist Harry Manoharlan proved that the molybdenum disulfide crystal lattice is arranged in a way that gives it unique electronic properties.
Molybdenum disulfide is a substance with a single-layer atomic structure: one molybdenum atom connects two sulfur atoms, and this triangular crystal lattice repeats in a horizontal plane continuously to form a paper-like structure. Molybdenum disulfide Natural rocks are the result of stacking multiple such monolayers together. "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," said Zheng Xiaolin.
According to the official website of Stanford University, the research team engraved the rugged "peaks" and "valleys" on the chips, spreading a single-layer atomic structure of molybdenum disulfide thereon, and then stretched the crystal lattice of molybdenum disulfide to "Bottom" or "mountain". This stretching changes the energy required for the electrons to move in the molybdenum disulfide crystal lattice and creates an artificial crystal with a variable energy gap.
Since the 2010 British scientists Andrzej Gommow and Konstantin Novosirov won the Nobel Prize for graphene discovering single-layered carbon atoms, scientists have been very interested in substances of monolayer atomic structure. In 2012, MIT scientists stretched the molybdenum disulfide crystal lattice in a simulation experiment and theoretically changed the energy gap of molybdenum disulfide. The Stanford University research team through the experiment truly realized the molybdenum disulfide lattice lattice stretching.
Researchers believe this experiment has laid the foundation for the scientific community to further innovate in the structure of the intraocular lens. Manoharlan believes that this research will have a wide range of effects on sensors, solar energy and other fields. In the solar field, the potential for making more efficient solar cells is due to the fact that this artificial lens structure is sensitive to a wider spectrum.
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