Band Modulation and Strain Fluctuation for Realizing High Average zT in GeTe

Xinyu Wang; Honghao Yao; Li YinWenhua XueZongwei ZhangSichen DuanLingjin ChenChen ChenJiehe SuiXingjun LiuYumei WangJun MaoQian ZhangXi Lin

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Band Modulation and Strain Fluctuation for Realizing High Average zT in GeTe

机译：Band Modulation and Strain Fluctuation for Realizing High Average zT in GeTe

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Recently, GeTe has emerged as a very promising thermoelectric material. However,the pristine GeTe exhibits intrinsically low Seebeck coefficient and highthermal conductivity. Therefore, resolving these issues is critical for further promotingits thermoelectric performance. Herein, PbTe and AgSbTe_2 are chosento form a solid solution with GeTe. Benefitting from the converged electronicbands and reduced thermal conductivity after AgSbTe_2 alloying, the thermoelectricperformance of GeTe-based materials is effectively improved. In addition,PbTe alloying can optimize the carrier concentration and further improve theeffective mass, and thus a remarkable enhancement in the Seebeck coefficientis realized. Moreover, intense phonon scattering occurs due to the introducedpoint defects at the Ge site, and the lattice thermal conductivity is effectivelyreduced to be as low as ≈0.47 W m~(?1) K~(?1). As a result, a high zT of ≈0.7 at 323 Kand ≈2.4 at 723 K can be achieved in (Pb_(0.15)Ge_(0.85)Te)_(0.8)(AgSbTe_2)_(0.2), leading toa record-high average zT of ≈1.8 and a high conversion efficiency of ≈14.8%under the temperature difference of 500 K.

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来源
《Advanced energy materials》 |2022年第26期|2201043.1-2201043.8|共8页
作者
Xinyu Wang; Honghao Yao; Li YinWenhua XueZongwei ZhangSichen DuanLingjin ChenChen ChenJiehe SuiXingjun LiuYumei WangJun MaoQian ZhangXi Lin;
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作者单位

School of Materials Science and Engineering and Instituteof Materials Genome and Big DataHarbin Institute of TechnologyShenzhen 518055, P. R. China;

School of Materials Science and Engineering and Instituteof Materials Genome and Big DataHarbin Institute of TechnologyShenzhen 518055, P. R. China, Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBei;

State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbin 150001, P. R. ChinaSchool of Materials Science and Engineering and Instituteof Materials Genome and Big DataHarbin Institute of TechnologyShenzhen 518055, P. R. China, State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbin 150001, P. R. ChiBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190, P. R. China;

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GeTe; phase transition; Pb alloying; TAGS; thermoelectric;

Band Modulation and Strain Fluctuation for Realizing High Average zT in GeTe

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