American scientists for the first time to create a thickness of only three atoms of molybdenum disulfide semiconductor film, which not only slender, but also has excellent electrical properties, can be widely used to create a variety of ultra-thin electronic devices.
Lead researcher and Corvall University assistant professor of chemistry and chemical biology, Jiwooge Parker said: "The electrical properties of the newly obtained molybdenum disulfide semiconductor films are comparable to molybdenum disulfide single crystals, but what we did was not Thin crystals, but 4-inch wafers (crystals sliced ​​at a certain azimuth). "
Parker said that in previous large-scale studies, molybdenum disulphide could only be planted dispersedly, just like isolated islands at sea, but creating a smooth, flat, ultra-thin sheet like paper was the way to practical equipment applications The only way.
Researchers used MOCVD technology to make the required flakes, which are widely used in industry but using other materials. According to the DailySciences Network, Parker's team systematically optimized this technology to tailor the environment and temperature to create new films in their latest research. They found that with a bit of hydrogen and in a completely dry environment, the crystals grow perfectly together.
Researchers led by David Mueller, a professor of applied and engineering physics at Cornell University, co-author of the research paper, tested the quality and performance of the films as they grew with advanced transmission electron microscopy. The results show that the semiconductor film, which has a thickness of only three atoms, can be stacked with silicon dioxide layer by layer to create a multi-layered, ultrathin electronic device that has been published in the recently published journal Nature .
The researchers also slightly modified the MOCVD method to create tungsten disulfide films with different electrical properties and colors, and they hoped to further refine the method to create other films of only a few atoms in thickness and eventually create novelty Electronic equipment and optoelectronic equipment.
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