My watch list
my.chemeurope.com  
Login  

High Thermoelectric Performance of New Rhombohedral Phase of GeSe stabilized through Alloying with AgSbSe2

Abstract

GeSe is a IV–VI semiconductor, like the excellent thermoelectric materials PbTe and SnSe. Orthorhombic GeSe has been predicted theoretically to have good thermoelectric performance but is difficult to dope experimentally. Like PbTe, rhombohedral GeTe has a multivalley band structure, which is ideal for thermoelectrics and also promotes the formation of Ge vacancies to provide enough carriers for electrical transport. Herein, we investigate the thermoelectric properties of GeSe alloyed with AgSbSe2, which stabilizes a new rhombohedral structure with higher symmetry that leads to a multivalley Fermi surface and a dramatic increase in carrier concentration. The zT of GeAg0.2Sb0.2Se1.4 reaches 0.86 at 710 K, which is 18 times higher than that of pristine GeSe and over four times higher than doped orthorhombic GeSe. Our results open a new avenue towards developing novel thermoelectric materials through crystal phase engineering using a strategy of entropy stabilization of high‐symmetry alloys.

Energieumwandlung: Die thermoelektrische Leistung von GeSe wird durch einen legierungsinduzierten Phasenübergang deutlich erhöht, mit einem zT‐Wert von 0.86 bei 710 K für GeAg0.2Sb0.2Se1.4. Das Ergebnis ebnet den Weg für die Entwicklung thermoelektrischer Materialien mittels Kristallphasen‐Engineering durch die entropische Stabilisierung hochsymmetrischer Legierungen.

Authors:   Zhiwei Huang, Samuel Miller, Binghui Ge, Mingtao Yan, Shashwat Anand, Tianmin Wu, Pengfei Nan, Yuanhu Zhu, Wei Zhuang, Jeffrey Snyder, Peng Jiang, Xinhe Bao; Zhiwei Huang, Samuel A. Miller, Binghui Ge, Mingtao Yan, Shashwat Anand, Tianmin Wu, Pengfei Nan, Yuanhu Zhu, Wei Zhuang, G. Jeffrey Snyder, Peng Jiang, Xinhe Bao
Journal:   Angewandte Chemie
Volume:   129
edition:   45
Year:   2017
Pages:   14301
DOI:   10.1002/ange.201708134
Publication date:   05-Oct-2017
More about Angewandte Chemie
  • News

    Productive Cascade

    Starting from available chemicals, a German team of researchers successfully completed the total synthesis of agarozizanol B, an interesting natural substance found in agarwood. As described in the journal Angewandte Chemie, the key sequence in the relatively short synthetic pathway is a ph ... more

    Hard Single-Molecule Magnets

    Magnets formed from a single molecule are of particular interest in data storage, since the ability to store a bit on every molecule could vastly increase the storage capacity of computers. Researchers have now developed a new molecular system with a particular magnetic hardness. The ingred ... more

    Cheaper Hydrogen Production

    Electrolytic hydrogen production powered by renewable energy is seen as an environmentally friendly means to ameliorate global climate and energy problems. In the journal Angewandte Chemie, a research team has now introduced a novel and inexpensive material for electrodes that may provide f ... more

More about Wiley
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE