Journal
ADVANCED SCIENCE
Volume 3, Issue 11, Pages -Publisher
WILEY
DOI: 10.1002/advs.201600196
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Funding
- National Natural Science Foundation of China [51422208, 11474219, 51401147]
- National Recruitment Program of Global Youth Experts (1000 Plan)
- Shanghai Institutions of Higher Learning
- fundamental research funds for the central universities
- Bayer-Tongji Eco-Construction & Material Academy [TB20140001]
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Conventional strategies for advancing thermoelectrics by minimizing the lattice thermal conductivity focus on phonon scattering for a short mean free path. Here, a design of slow phonon propagation as an effective approach for high-performance thermoelectrics is shown. Taking Ag8SnSe6 as an example, which shows one of the lowest sound velocities among known thermoelectric semiconductors, the lattice thermal conductivity is found to be as low as 0.2 W m(-1) K-1 in the entire temperature range. As a result, a peak thermoelectric figure of merit zT > 1.2 and an average zT as high as approximate to 0.8 are achieved in Nb-doped materials, without relying on a high thermoelectric power factor. This work demonstrates not only a guiding principle of low sound velocity for minimal lattice thermal conductivity and therefore high zT, but also argyrodite compounds as promising thermoelectric materials with weak chemical bonds and heavy constituent elements.
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