Enhanced Thermoelectric Performance in GeTe by Synergy of Midgap state and Band Convergence

Zhe Guo; Gang Wu; Xiaojian TanRuoyu WangZongwei ZhangGuangjie WuQiang ZhangJiehua WuGuo-Qiang LiuJun Jiang

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Enhanced Thermoelectric Performance in GeTe by Synergy of Midgap state and Band Convergence

机译：Enhanced Thermoelectric Performance in GeTe by Synergy of Midgap state and Band Convergence

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The good co-existence of midgap state and valence band degeneracy isrealized in Bi-alloyed GeTe through the In-Cd codoping to play different butcomplementary roles in the valence band structure modification. In dopinginduces midgap state and results in a considerably improved Seebeck coefficientnear room temperature, while Cd doping significantly increases theSeebeck coefficient in the mid-high temperature region by promoting thevalence band convergence. The synergistic effects obviously increase thedensity of state effective mass from 1.39 to 2.65 m0, and the correspondingcarrier mobility still reaches 34.3 cm~2 V~(?1) s~(?1) at room temperature. Moreover,the Bi-In-Cd co-alloying introduces various phonon scattering centersincluding nanoprecipitates and strain field fluctuations and suppresses thelattice thermal conductivity to a rather low value of 0.56 W m~(?1) K~(?1) at 600 K.As a result, the Ge_(0.89)Bi_(0.06)In_(0.01)Cd_(0.04)Te sample obtains excellent thermoelectricproperties of zT_(max) ≈2.12 at 650 K and zT_(avg) ≈1.43 between 300 and 773 K.This study illustrates that the thermoelectric performance of GeTe can beoptimized in a wide temperature range through the synergy of midgap stateand valence band convergence.

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来源
《Advanced functional materials》 |2023年第11期|2212421.1-2212421.10|共10页
作者
Zhe Guo; Gang Wu; Xiaojian TanRuoyu WangZongwei ZhangGuangjie WuQiang ZhangJiehua WuGuo-Qiang LiuJun Jiang;
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作者单位

Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201, China University of Chinese Academy of SciencesBeijing 100049, China;

Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201, China;

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正文语种英语
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band convergences; GeTe; midgap states; thermoelectrics;

Enhanced Thermoelectric Performance in GeTe by Synergy of Midgap state and Band Convergence

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