期刊
ADVANCED MATERIALS
卷 32, 期 36, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002702
关键词
flexible fibers; high thermoelectric properties; laser recrystallization; single-crystal SnSe; wearable fabrics
类别
资金
- Singapore Ministry of Education Academic Research Fund Tier 2 [MOE2019-T2-2-127]
- Singapore Ministry of Education [MOE2019-T1-001-103, MOE2019-T1-001-111]
- Singapore National Research Foundation Competitive Research Program [NRF-CRP18-2017-02]
- Nanyang Technological University
- Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of China [51888103]
- Chinese Academy of Sciences Talents Program [E0290706]
- National Natural Science Foundation of China [11804354]
- Shenzhen Basic Research Grant [JCYJ20180507182431967]
Single-crystal tin selenide (SnSe), a record holder of high-performance thermoelectric materials, enables high-efficient interconversion between heat and electricity for power generation or refrigeration. However, the rigid bulky SnSe cannot satisfy the applications for flexible and wearable devices. Here, a method is demonstrated to achieve ultralong single-crystal SnSe wire with rock-salt structure and high thermoelectric performance with diameters from micro- to nanoscale. This method starts from thermally drawing SnSe into a flexible fiber-like substrate, which is polycrystalline, highly flexible, ultralong, and mechanically stable. Then a CO(2)laser is employed to recrystallize the SnSe core to single-crystal over the entire fiber. Both theoretical and experimental studies demonstrate that the single-crystal rock-salt SnSe fibers possess high thermoelectric properties, significantly enhancing theZTvalue to 2 at 862 K. This simple and low-cost approach offers a promising path to engage the fiber-shaped single-crystal materials in applications from 1D fiber devices to multidimensional wearable fabrics.
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