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Thermoelectric p-Type Ag9GaTe6 with an Intrinsically Low Lattice Thermal Conductivity
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-14 00:00:00 , DOI: 10.1021/acsaem.9b02330 Siqi Lin 1 , Wen Li 1 , Zhonglin Bu 1 , Bing Shan 1 , Yanzhong Pei 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-14 00:00:00 , DOI: 10.1021/acsaem.9b02330 Siqi Lin 1 , Wen Li 1 , Zhonglin Bu 1 , Bing Shan 1 , Yanzhong Pei 1
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Ag-based argyrodites with a general formula of Ag(12–n)Bn+X6 (B = Ga/Al/Si/Ge/Sn and X = S/Se/Te) have recently attracted much attention as promising thermoelectrics because of their ultralow lattice thermal conductivity and richness in the composition. Most of these Ag-based argyrodites are n-type conduction semiconductors and show a promising thermoelectric figure of merit (zT). However, p-type argyrodites have been much less reported, and this motivates the current work to focus on a novel p-type argyrodite Ag9GaTe6 for thermoelectric applications. Although various doping (Cd, Zn, Mg, Nb, Se, and Cu) were found to insufficiently increase the hole concentration for a degenerate conduction, a peak zT of 0.65 at 600 K can still be realized in p-type Ag9Ga0.95Cd0.05Te6. This largely relies on a lattice thermal conductivity of only ∼0.2 W/m-K (nearly independent with temperature and doping), which results from the low sound velocity, strong lattice anharmonicity, and complex crystal structure. This work demonstrates the potential of Ag9GaTe6 as a promising p-type thermoelectric material, particularly with a further increase in hole concentration.
中文翻译：
晶格热导率极低的热电p型Ag 9 GaTe 6
通式为Ag （12– n） B n + X 6（B = Ga / Al / Si / Ge / Sn和X = S / Se / Te）的基于Ag的银辉石最近作为有前途的热电学备受关注，因为它们的超低晶格导热性和组成丰富性。这些大多数基于Ag的银辉石是n型导电半导体，并且显示出有希望的热电品质因数（zT）。然而，关于p型银辉石的报道很少，这促使当前的工作集中在新型的p型银辉石Ag 9 GaTe 6上。用于热电应用。尽管发现各种掺杂（Cd，Zn，Mg，Nb，Se和Cu）不足以增加空穴浓度以降低导电性，但在p型Ag 9 Ga 0.95中仍可在600 K时实现0.65的峰值zT。Cd 0.05 Te 6。这主要取决于晶格导热系数仅为〜0.2 W / mK（几乎与温度和掺杂无关），这是由于声速低，晶格非谐性强和晶体结构复杂所致。这项工作证明了Ag 9 GaTe 6作为有前景的p的潜力。型热电材料，尤其是空穴浓度进一步增加。
更新日期：2020-01-14
中文翻译：
晶格热导率极低的热电p型Ag 9 GaTe 6
通式为Ag （12– n） B n + X 6（B = Ga / Al / Si / Ge / Sn和X = S / Se / Te）的基于Ag的银辉石最近作为有前途的热电学备受关注，因为它们的超低晶格导热性和组成丰富性。这些大多数基于Ag的银辉石是n型导电半导体，并且显示出有希望的热电品质因数（zT）。然而，关于p型银辉石的报道很少，这促使当前的工作集中在新型的p型银辉石Ag 9 GaTe 6上。用于热电应用。尽管发现各种掺杂（Cd，Zn，Mg，Nb，Se和Cu）不足以增加空穴浓度以降低导电性，但在p型Ag 9 Ga 0.95中仍可在600 K时实现0.65的峰值zT。Cd 0.05 Te 6。这主要取决于晶格导热系数仅为〜0.2 W / mK（几乎与温度和掺杂无关），这是由于声速低，晶格非谐性强和晶体结构复杂所致。这项工作证明了Ag 9 GaTe 6作为有前景的p的潜力。型热电材料，尤其是空穴浓度进一步增加。
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