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Title: Studies on Thermoelectric Properties of n-type Polycrystalline SnSe 1-x S x by Iodine Doping

Journal Article · · Advanced Energy Materials
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  1. Department of Physics and TcSUH, University of Houston, Houston TX 77204 USA
  2. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge MA 02139 USA

Iodine-doped n-type SnSe polycrystalline by melting and hot pressing is prepared. The prepared material is anisotropic with a peak ZT of ≈0.8 at about 773 K measured along the hot pressing direction. This is the first report on thermoelectric properties of n-type Sn chalcogenide alloys. With increasing content of iodine, the carrier concentration changed from 2.3 × 1017 cm-3 (p-type) to 5.0 × 1015 cm-3 (n-type) then to 2.0 × 1017 cm-3 (n-type). The decent ZT is mainly attributed to the intrinsically low thermal conductivity due to the high anharmonicity of the chemical bonds like those in p-type SnSe. By alloying with 10 at% SnS, even lower thermal conductivity and an enhanced Seebeck coefficient were achieved, leading to an increased ZT of ≈1.0 at about 773 K measured also along the hot pressing direction.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
SC0001299; FG02-09ER46577
OSTI ID:
1387039
Journal Information:
Advanced Energy Materials, Vol. 5, Issue 12; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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