Single crystal materials have excellent mechanical stability, low optical loss and excellent electrical conductivity, and are widely used in high-performance optics and semiconductor industries. For example, SnSe single crystal material with excellent thermoelectric properties can realize the mutual conversion of thermal energy and electric energy, and has broad application prospects in the fields of thermoelectric power generation and thermoelectric refrigeration. However, due to the slow growth rate of the traditional single crystal growth method, strict manufacturing conditions, and high processing cost, the large-scale industrial application of single crystal SnSe materials is restricted.
The Energy Storage R&D Center of the Institute of Engineering Thermophysics of the Chinese Academy of Sciences, together with Nanyang Technological University of Singapore, Cornell University and Beihang University, etc., reported a new type of single crystal SnSe thermoelectric based on fiber thermal drawing and laser recrystallization effect Fiber manufacturing technology has broken through the difficulties in the preparation of high-quality single crystal flexible thermoelectric fibers, realizing large-scale growth of fiber single crystal materials, and providing new ideas for the development of complex and efficient thermoelectric single crystal fibers and their fabrics. The researchers said that in the future, flexible wearable thermoelectric fibers and fabrics can collect energy from body heat, and use the temperature difference between the human body and the external environment to power low-power wearable electronic devices; it can be used for thermoelectric cooling and temperature control to maintain the comfort of human body temperature Sex.
The team demonstrated a universal and feasible recrystallization method based on the laser thermal effect that can produce ultra-long SnSe single crystal fibers with diameters ranging from micrometers to nanometers. Experiments have shown that in addition to the common Pnma and Cmcm phases of SnSe single crystals, there is a stable single crystal rock salt Fm-3m phase. At 862K, the ZT value of the single crystal SnSe fiber of the Fm-3m phase is as high as 2, which is much larger than the ZT value of the polycrystalline SnSe fiber and is equivalent to the single crystal SnSe of the Cmcm phase. The researchers prepared a single thermoelectric fiber with high-density p-type and n-type SnSe micro/nanowire arrays, and realized the PN structure of flexible thermoelectric devices in the fiber, which is a large-area, lightweight, breathable, high-performance flexible wearable Thermoelectric fabric devices provide a new way to show a conceptual demonstration of the continuous power generation of monocrystalline thermoelectric fabrics using the temperature difference between the human body and the environment.
The research work is supported by the Chinese Academy of Sciences Talent Program and the National Natural Science Foundation of China’s "Orderly Conversion of Energy" Basic Science Center project. The relevant research results have been published in Advanced Materials recently.
Figure 1. Flexible single crystal SnSe thermoelectric fiber manufacturing technology based on fiber thermal drawing and laser recrystallization effect
Figure 2. Performance of flexible single crystal SnSe thermoelectric fiber and preparation of multi-core PN thermoelectric material in fiber
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