Low Sound Velocity Contributing to the High Thermoelectric Performance of Ag8SnSe6

Advanced Science - Tập 3 Số 11 - 2016
Wen Li1, Siqi Lin1, Binghui Ge2, Jiong Yang3, Wenqing Zhang3, Yanzhong Pei1
1Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, 4800 Caoan Rd, Shanghai, 201804 China
2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, China
3Materials Genome Institute, Shanghai University, Shanghai 200444, China

Tóm tắt

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 ≈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.

Từ khóa


Tài liệu tham khảo

10.1126/science.1158899

10.1038/nature09996

10.1038/am.2012.52

10.1103/PhysRevLett.108.166601

10.1016/j.jmat.2015.09.001

10.1038/ncomms9144

10.1038/ncomms10287

10.1002/aenm.201400486

10.1126/science.1092963

10.1038/nature11439

10.1126/science.1156446

10.1002/adfm.201000878

10.1126/science.aaa4166

10.1016/j.nanoen.2015.03.034

10.1002/adfm.201402663

10.1038/nmat3273

10.1073/pnas.1410349111

10.1038/nature13184

10.1103/PhysRevLett.101.035901

Slack G. A., 1995, CRC Handbook of Thermoelectrics, 406

10.1063/1.2009828

10.1038/nmat2273

10.1021/cm060261t

10.1002/adma.201501970

10.1039/c2ee21274a

10.1016/0025-5408(79)90125-9

I. S.Osypyshyn N. V.Chekailo V. I. I.Vsesoyuzn presented in part at the Conference of the Chemistry Physics and Technical Applications of Chalcogenides 1988 3 282.

10.1016/j.jallcom.2004.12.038

10.1002/pssr.200701302

10.1143/JJAP.48.011603

10.1002/pssr.201004278

10.1016/S0925-8388(01)01970-3

M.Kocher A.Jain S. P.Ong G.Hautier (https://www.materialsproject.org/materials/mp‐17984/).

10.1103/PhysRevB.80.125205

10.1039/C5TC03325J

10.1002/adma.201004200

10.1039/c1ee01314a

10.1002/aenm.201000072

10.1002/adfm.201300663

10.1103/PhysRev.80.72

10.1073/pnas.1111419109

10.1002/aenm.201200683

10.1002/aenm.201400600

10.1038/nmat4430

10.1039/C3EE43438A

10.1126/science.aad3749

10.1002/aenm.201200970

10.1039/C5TC03068D

10.1021/ja5056092

10.1039/C6TC00810K

10.1039/c1jm13888j

10.1038/nmat3273

10.1103/PhysRevB.87.165201

10.1038/npjcompumats.2015.15

10.1039/c0ee00456a

10.1021/ja111199y

10.1017/CBO9780511805769

10.1103/PhysRevB.78.134106

10.1103/PhysRevB.54.11169

10.1103/PhysRevB.59.1758

10.1103/PhysRevB.50.17953

Thông tin
Thông tin xuất bản

Advanced Science

Tập 3 Số 11

Thông tin tác giả