What is the most insulating material in the world? Generally speaking, the materials with the worst thermal conductivity (or thermal insulators) are so-called porous materials. Heat is transferred in the crystal in the form of phonons. Therefore, if the structure of the crystal is fairly regular, the phonons can easily travel far away. That is, it has high thermal conductivity. Conversely, if the regularity of the lattice atomic structure is poor. Phonons quickly dissipate energy in the lattice. At this time, the thermal conductivity of the material is naturally very poor.

      University of Oregon chemistry professor David? Johnson (David c. JOhnson) found. The thermal conductivity of tungsten diselenide thin film is worse than that of single crystal tungsten diselenide. About 1/100,000th of that of diamonds with the best thermal conductivity. This new material not only has thermal conductivity like a porous material. More importantly, its density is very high. Probably about the same as copper. Tungsten diselenide WSe2 is the material with the lowest thermal conductivity in the world. The low thermal conductivity of tungsten diselenide means that the heat in the system is not easily dissipated, in other words, the energy conversion efficiency of the system will be higher. Hence the application of this new material. It is very likely that the efficiency of energy use will be greatly improved.The low-dimensional material online 91cailiao.cn of Juna Group provides WSe2 crystal material with excellent performance, the purity is as high as 99.995%, and a single layer can be obtained after mechanical peeling, which makes the research of this material in China make a significant progress.
       Researchers at the Vienna University of Technology in Austria have developed for the first time a diode made of tungsten diselenide (WSe2), which experiments show that this material can be used in ultrathin soft Sexual solar cells. Tungsten diselenide (WSe2), the main structure is composed of upper and lower layers of selenium atoms connected to the middle layer of tungsten atoms. The WSe2 material, like graphene, absorbs light, and the absorbed light can be used to generate electricity. This thin layer is indeed light and thin, allowing about 95 percent of the light to pass through, but one-tenth of the remaining 5 percent is absorbed by the material and converted into electricity. Therefore, its internal efficiency is quite high. If multiple ultrathin layers are stacked on top of each other, a large fraction of this incoming light can be used effectively -- but sometimes this high transparency can have a beneficial side effect.