American researchers have discovered that a crystalline semiconductor material called antimony tin (CsSnI3) has unique thermoelectric properties that can cut off most of the heat transfer while maintaining high electrical conductivity. They published an article published in the “Journal of the National Academy of Sciences” of the United States, pointing out that the thermoelectric properties of this material are unique and its application prospects are very broad.

Bismuth tin oxide is a semiconducting material that was discovered decades ago, but it has only received the attention of some scientists in recent years. This time, a team led by researchers at the US Department of Energy's Lawrence Berkeley National Laboratory discovered a collective vibration mechanism in the yttrium tin oxide nanowires: in a crystal structure, the distance between atoms will collectively shrink or increase. Big. The researchers found that this vibration mechanism interferes with heat transfer, and since the antimony iodide is composed of an ordered single-crystal structure, this vibration effect will not hinder the passage of current. Electrons are like submarines in the rough seas, and they can safely navigate in calm waters.

To verify the thermal conductivity of yttrium tin oxide, the researchers used several nanowires and multilayer nanowires of different materials to conduct experiments and compare their thermoelectric properties and thermal conductivity. The results show that in these materials with a continuous crystal structure, the thermal conductivity of yttrium tin oxide has the lowest level.

The researchers pointed out that the thermoelectric materials mainly have two applications: cooling and thermoelectric conversion. The thermoelectric properties of yttrium tin oxide are special and are more suitable for refrigeration. In addition, this material has another advantage: it is easier to mass-produce than the typical thermoelectric materials such as silicon germanium. They will next develop yttrium tin alloy iodide materials to improve their thermoelectric properties. In addition, they also hope to more fully exploit the thermoelectric properties of this material through similar doping techniques. (Reporter Liu Haiying)

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