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Se替代Te对BiCuTeO电热输运性能的影响

黄平 游理 梁星 张继业 骆军

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Se替代Te对BiCuTeO电热输运性能的影响

黄平, 游理, 梁星, 张继业, 骆军

Effects of Se substitution for Te on electrical and thermal transport properties of BiCuTeO

Huang Ping, You Li, Liang Xing, Zhang Ji-Ye, Luo Jun
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  • 层状氧硫族化合物由于其本征的低晶格热导率和可观的热电性能吸引了广泛关注, 其中以BiCuSeO化合物的热电性能最为优异. 但是, 其同晶型化合物BiCuTeO, 由于带隙较小且存在大量本征Cu空位, 导致载流子浓度较高, 热电性能较差, 从而研究较少. 针对BiCuTeO存在的上述问题, 本文利用Se替代部分Te, 以期能够展宽带隙并减少Cu空位, 提高其热电性能. 采用固相反应结合快速热压烧结制备了BiCuTe1-xSexO(x = 0, 0.1, 0.2, 0.3和0.4)块体热电材料, 并系统地研究了该体系的电热输运性能. 研究结果表明, 利用Se替代Te, 可以使BiCuTeO导电层化学键强度增加、带隙增大、载流子有效质量增加以及载流子散射增强, 从而导致载流子浓度和迁移率同时降低, 进而电导率随着Se含量增加而剧烈降低, Seebeck系数则显著增大. 由于综合电输运性能恶化, 功率因子随着Se含量增加而减小, 导致热电优值zT随着Se含量增加而降低. 最终, Se含量为x = 0.1的样品, 在室温和723 K时的zT值分别达到约0.3和0.7, 仍然在较宽温区内保持较高的zT值. 由于Se替代Te改变了BiCuTeO的能带结构, 通过载流子浓度优化, 有望进一步提高其热电性能.
    Recently, layered oxychalcogenide has attracted significant scientific attention because of its intriguing electronic properties, intrinsically low thermal conductivity and, correspondingly, outstanding thermoelectric properties, of which the BiCuSeO possesses the best thermoelectric performance ever reported. For instance, the optimized zT value of BiCuSeO system reaches 1.5 at 873 K through dual-doping approach. Such a zT value is comparable to those of the state-of-art p-type lead chalcogenide thermoelectric materials. However, comparing with BiCuSeO compound, little effort has been devoted to the isomorphic analogue BiCuTeO. On the one hand, the BiCuTeO has a pretty small band gap (0.4 eV) which limits its working temperature range. On the other hand, numerous intrinsic Cu vacancies are present in BiCuTeO due to the weak Cu-Te chemical bonding, leading to an excessive carrier concentration. Thus, further increasing carrier concentration through doping will lead to a deterioration of electrical transport properties and thus reduce the zT value. Herein, we choose Se and partially substitute it for Te in the BiCuTeO to enlarge the band gap and reduce intrinsic Cu vacancies by strengthening the chemical bonding in the conductive layers. By combining solid-phase reaction with hot-pressed sintering, the BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3, 0.4) bulk thermoelectric materials are prepared, and their microscopic morphology and thermoelectric transport properties are systematically investigated. Our experimental results show that the substitution of Se for part of Te results in strengthening chemical bonding in the conducting layer, enlarging the band gap, increasing the carrier effective mass, reducing the carrier concentration, and enhancing the carrier scattering. Therefore, the electrical conductivity dramatically decreases but the Seebeck coefficient significantly increases with Se content increasing, leading to the decrease of thermoelectric power factor. Furthermore, a slight reduction of the total thermal conductivity is realized by Se alloying due to the decrease of the electronic thermal conductivity. Consequently, the dimensionless figure of merit zT decreases with the Se content increasing because electrical transport properties are deteriorated seriously. Finally, the zT value of 0.3 at room temperature and 0.7 at 723 K are achieved for the sample with x = 0.1, indicating that the Se substituted BiCuTeO sample can still maintain comparative zT values in a wide temperature range. Considering that the effective mass of BiCuTeO is significantly increased by Se alloying, the thermoelectric performance of BiCuTe1–xSexO compound might be further improved by optimizing the carrier concentration.
      通信作者: 骆军, junluo@shu.edu.cn
    • 基金项目: 国家自然科学基金(批准号: 51772186, 51632005)资助的课题.
      Corresponding author: Luo Jun, junluo@shu.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 51772186, 51632005).
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    Barreteau C, Berardan D, Amzallag E, Zhao L D, Dragoe N 2012 Chem. Mater. 24 3168Google Scholar

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    Li J, Sui J H, Barreteau C, Berardan D, Dragoe N, Cai W, Pei Y L, Zhao L D 2013 J. Alloys Compd. 551 649Google Scholar

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    Lan J L, Liu Y C, Zhan B, Lin Y H, Zhang B P, Yuan X, Zhang W Q, Xu W, Nan C W 2013 Adv. Mater. 25 5086Google Scholar

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    Liu Y C, Zheng Y H, Zhan B, Chen K, Butt S, Zhang B P, Lin Y H 2015 J. Eur. Ceram. Soc. 35 845Google Scholar

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    Pei Y L, Wu H J, Wu D, Zheng F S, He J Q 2014 J. Am. Chem. Soc. 136 13902Google Scholar

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    Sui J H, Li J, He J Q, Pei Y L, Berardan D, Wu H J, Dragoe N, Cai W, Zhao L D 2013 Energy Environ. Sci. 6 2916Google Scholar

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    Liu Y, Lan J L, Xu W, Liu Y C, Pei Y L, Cheng B, Liu D B, Lin Y H, Zhao L D 2013 Chem. Commun. 49 8075Google Scholar

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    Pan L, Lang Y D, Zhao L, Berardan D, Amzallag E, Xu C, Gu Y F, Chen C C, Zhao L D, Shen X D, Lyu Y N, Lu C H, Wang Y F 2018 J. Mater. Chem. A 6 13340Google Scholar

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    Liu Y, Zhao L D, Zhu Y, Liu Y, Li F, Yu M, Liu D B, Xu W, Lin Y H, Nan C W 2016 Adv. Energy Mater. 6 1502423Google Scholar

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  • 图 1  BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3和0.4) 热压样品的 (a) XRD图谱; (b)晶胞体积V; (c) 晶格常数c; (d) 晶格常数a. 图(a) 中提供的BiCuTeO标准图谱为文献精修数据计算所得[23]; 图(b)—图(d) 中实线为线性拟合结果

    Fig. 1.  (a) XRD patterns of the hot-pressed BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3, 0.4) samples; (b) cell volume V; (c) lattice parameter c; (d) lattice parameter a as a function of the Se content. The standard XRD pattern of BiCuTeO in (a) is calculated from the Rietveld refinement data given by literature[23]. The solid lines in (b)−(d) are the linear fitting results of the experiment data.

    图 2  BiCuTe1–xSexO (x = 0, 0.2和0.4) 抛光样品的SEM图像(插图为相应的EDS面扫描元素分布图像)((a)—(c))以及断面SEM形貌图((d)—(f))

    Fig. 2.  SEM images of polished samples (the insets are the EDS elemental mapping images) ((a)—(c)) and SEM images of fracture surfaces ((d)−(f))for BiCuTe1–xSexO (x = 0, 0.2, 0.4) compounds.

    图 3  BiCuTe1-xSexO样品 (x = 0, 0.1, 0.2, 0.3和0.4) 的 (a) 电导率σ; (b) Seebeck系数S; (c) 功率因子S2σ随温度的变化曲线; (d) 样品的载流子浓度n和迁移率${\mu}$随Se含量的变化曲线. 图(a)—(c) 中短划线和点划线分别为文献中未掺杂的BiCuTeO[23]与BiCuSeO[14]的电输运性能

    Fig. 3.  Temperature dependent electrical transport properties of BiCuTe1-xSexO (x = 0, 0.1, 0.2, 0.3, 0.4) samples: (a) Electrical conductivity σ; (b) Seebeck coefficients S; (c) power factor S2σ. (d) Se cotent dependence of room temperature hole concentration n and mobility ${\mu}$. The dashed and dotted lines in (a)−(c) represent the electrical transport properties of undoped BiCuSeO[14] and BiCuTeO[23], respectively.

    图 4  (a) 重掺杂BiCuSeO[14,16,28]和BiCuTeO[24,25]的载流子有效质量m*随载流子浓度n的变化曲线; (b) Se掺杂BiCuTeO(本工作)和Te掺杂BiCuSeO[28]的载流子有效质量m*随载流子浓度n的变化曲线

    Fig. 4.  Hole concentration n dependent effective mass m* of (a) Heavily doped BiCuSeO[14,16,28] and BiCuTeO[24,25]; (b) Se doped BiCuTeO (this work) and Te doped BiCuSeO[28].

    图 5  BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3和0.4) 样品的(a) 总热导率和(b) 电子热导率、晶格热导率与双极扩散热导率之和随温度的变化曲线. 图(a)中短划线和点划线分别为未掺杂的BiCuTeO[23]与BiCuSeO[14]的热输运性能

    Fig. 5.  Temperature dependent thermal transport properties of BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3, 0.4) samples: (a) Total thermal conductivity; (b) the combination of lattice and bipolar thermal conductivity, and the electronic thermal conductivity. The dashed and dotted lines in (a) represent the total thermal conductivities of undoped BiCuTeO[23] and BiCuSeO[14], respectively.

    图 6  BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3和0.4)样品的zT值随温度的变化曲线. 短划线和点划线分别为未掺杂的BiCuTeO[23]与BiCuSeO[14]的zT值

    Fig. 6.  Temperature dependent zT values of BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3, 0.4) samples. The dashed and dotted lines represent the zT values of undoped BiCuTeO[23] and BiCuSeO[14], respectively.

    表 1  室温下BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3和0.4) 样品的载流子浓度 (n)、迁移率 (${\mu}$)、电导率 (σ) 以及载流子有效质量 (m*)

    Table 1.  Room temperature carrier concentrations (n), Hall mobilities (${\mu}$), electrical conductivities (σ) and effective masses of BiCuTe1–xSexO (x = 0, 0.1, 0.2, 0.3, 0.4) samples.

    样品载流子浓度n/cm–3迁移率${\mu}$/cm2·V–1·s–1电导率σ/Sm–1m*/m0
    BiCuTeO8.4 × 101928.23.81 × 1042.42
    BiCuTe0.9Se0.1O7.0 × 101911.81.32 × 1042.94
    BiCuTe0.8Se0.2O6.3 × 10197.97.89 × 1033.07
    BiCuTe0.7Se0.3O5.1 × 10194.03.31 × 1033.2
    BiCuTe0.6Se0.4O5.8 × 10191.91.73 × 1034.28
    下载: 导出CSV
  • [1]

    Snyder G J, Toberer E S 2008 Nat. Mater. 7 105Google Scholar

    [2]

    He J, Tritt T M 2017 Science 357 eaak9997Google Scholar

    [3]

    Luo J, You L, Zhang J Y, Guo K, Zhu H T, Gu L, Yang Z Z, Li X, Yang J, Zhang W Q 2017 ACS Appl. Mater. Interfaces 9 8729Google Scholar

    [4]

    Pei Y Z, Shi X Y, LaLonde A, Wang H, Chen L D, Snyder G J 2011 Nature 473 66Google Scholar

    [5]

    Heremans J P, Jovovic V, Toberer E S, Saramat A, Kurosaki K, Charoenphakdee A, Yamanaka S, Snyder G J 2008 Science 321 554Google Scholar

    [6]

    Biswas K, He J Q, Blum I D, Wu C I, Hogan T P, Seidman D N, Dravid V P, Kanatzidis M G 2012 Nature 489 414Google Scholar

    [7]

    You L, Liu Y F, Li X, Nan P F, Ge B H, Jiang Y, Luo P F, Pan S S, Pei Y Z, Zhang W Q, Snyder G J, Yang J, Zhang J Y, Luo J 2018 Energy Environ. Sci. 11 1848Google Scholar

    [8]

    Zhou W X, Chen K Q 2015 Carbon 85 24Google Scholar

    [9]

    Chen X K, Xie Z X, Zhou W X, Tang L M, Chen K Q 2016 Appl. Phys. Lett. 109 023101Google Scholar

    [10]

    Chen X K, Liu J, Peng Z H, Du D, Chen K Q 2017 Appl. Phys. Lett. 110 091907Google Scholar

    [11]

    Lin S Q, Li W, Li S S, Zhang X Y, Chen Z W, Xu Y D, Chen Y, Pei Y Z 2017 Joule 1 816Google Scholar

    [12]

    Li J, Sui J H, Pei Y L, Barreteau C, Berardan D, Dragoe N, Cai W, He J Q, Zhao L D 2012 Energy Environ. Sci. 5 8543Google Scholar

    [13]

    Barreteau C, Berardan D, Amzallag E, Zhao L D, Dragoe N 2012 Chem. Mater. 24 3168Google Scholar

    [14]

    Pei Y L, He J Q, Li J F, Li F, Liu Q J, Pan W, Barreteau C, Berardan D, Dragoe N, Zhao L D 2013 NPG Asia Mater. 5 e47Google Scholar

    [15]

    Li J, Sui J H, Barreteau C, Berardan D, Dragoe N, Cai W, Pei Y L, Zhao L D 2013 J. Alloys Compd. 551 649Google Scholar

    [16]

    Lan J L, Liu Y C, Zhan B, Lin Y H, Zhang B P, Yuan X, Zhang W Q, Xu W, Nan C W 2013 Adv. Mater. 25 5086Google Scholar

    [17]

    Liu Y C, Zheng Y H, Zhan B, Chen K, Butt S, Zhang B P, Lin Y H 2015 J. Eur. Ceram. Soc. 35 845Google Scholar

    [18]

    Pei Y L, Wu H J, Wu D, Zheng F S, He J Q 2014 J. Am. Chem. Soc. 136 13902Google Scholar

    [19]

    Sui J H, Li J, He J Q, Pei Y L, Berardan D, Wu H J, Dragoe N, Cai W, Zhao L D 2013 Energy Environ. Sci. 6 2916Google Scholar

    [20]

    Liu Y, Lan J L, Xu W, Liu Y C, Pei Y L, Cheng B, Liu D B, Lin Y H, Zhao L D 2013 Chem. Commun. 49 8075Google Scholar

    [21]

    Pan L, Lang Y D, Zhao L, Berardan D, Amzallag E, Xu C, Gu Y F, Chen C C, Zhao L D, Shen X D, Lyu Y N, Lu C H, Wang Y F 2018 J. Mater. Chem. A 6 13340Google Scholar

    [22]

    Liu Y, Zhao L D, Zhu Y, Liu Y, Li F, Yu M, Liu D B, Xu W, Lin Y H, Nan C W 2016 Adv. Energy Mater. 6 1502423Google Scholar

    [23]

    Vaqueiro P, Guelou G, Stec M, Guilmeau E, Powell A V 2013 J. Mater. Chem. A 1 520Google Scholar

    [24]

    An T H, Lim Y S, Choi H S, Seo W S, Park C H, Kim G R, Park C, Lee C H, Shim J H 2014 J. Mater. Chem. A 2 19759Google Scholar

    [25]

    An T H, Lim Y S, Seo W S, Park C H, Yoo M D, Park C, Lee C H, Shim J H 2017 J. Electron. Mater. 46 2717Google Scholar

    [26]

    Barreteau C, Berardan D, Zhao L D, Dragoe N 2013 J. Mater. Chem. A 1 2921Google Scholar

    [27]

    Pichanusakorn P, Bandaru P 2010 Mater. Sci. Eng., R 67 19Google Scholar

    [28]

    Ren G K, Wang S Y, Zhu Y C, Ventura K J, Tan X, Xu W, Lin Y H, Yang J H, Nan C W 2017 Energy Environ. Sci. 10 1590Google Scholar

    [29]

    Lee C, An T H, Gordon E E, Ji H S, Park C, Shim J H, Lim Y S, Whangbo M H 2017 Chem. Mater. 29 2348Google Scholar

    [30]

    Ul Islam A K M F, Helal M A, Liton M N H, Kamruzzaman M, Islam H M T 2017 Indian J. Phys. 91 403Google Scholar

    [31]

    Wang H, LaLonde A D, Pei Y Z, Snyder G J 2013 Adv. Funct. Mater. 23 1586Google Scholar

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出版历程
  • 收稿日期:  2018-10-15
  • 修回日期:  2019-02-04
  • 上网日期:  2019-03-23
  • 刊出日期:  2019-04-05

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