epitaxial growth, intrinsic point defects and electronic transport optimization of MnTe films

Wang Wei; Liu Wei; Xie Sen; Ge Hao-Ran; Ouyang Yu-Jie; Zhang Cheng; Hua Fu-Qiang; Zhang Min; Tang Xin-Feng

doi:10.7498/aps.71.20212350

Abstract

The NiAs-type MnTe compound is one of important and environmental friendly p-type thermoelectric materials for generating intermediate temperature powern. The low hole concentration in the pristine MnTe greatly restricts its thermoelectric performance. However, the systematic experimental studies of thermoelectric materials are still lacking so far. In this work, MnTe thin films are grown by molecular beam epitaxy (MBE) technique, and their intrinsic point defect structures are characterized by scanning tunneling microscope (STM). Through the regulation of the intrinsic point defects, the electrical transport performances of MnTe films are remarkably improved. The results show that Mn vacancies (V_Mn) and Te vacancies (V_Te) are the dominant intrinsic point defects in MnTe film. With the increase of the substrate temperature (T_sub) and the decrease of the Mn:Te flux ratio, the hole concentration in MnTe film increases greatly, reaching a maximum value of 21.5 × 10¹⁹ cm^–3, which is one order of magnitude higher than that of the intrinsic MnTe bulk. This is attributed to the significantly increased concentration of p-type V_Mn in MnTe film, and thus leads the conductivity (σ) and power factor (PF) to increase remarkably. Finally, the MnTe film grown at T_sub = 280 ℃ and Mn∶Te = 1∶12 obtains the maximum PF of 1.3 μW·cm^–1·K^–2 at 483 K in all grown films. This study clarifies the characteristics of intrinsic point defects and their relationship with the electrical transport properties of MnTe based compounds, which provides an importantguidance for further optimizing their thermoelectric performances.

Keywords:

Authors and contacts

1.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2.
International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

Corresponding author: Liu Wei, w.liu@whut.edu.cn ; Tang Xin-Feng, tangxf@whut.edu.cn

Funds: Project supported by the National Key Research and Development Program, China(Grant No. 2018YFB0703600) and the Key Program of the National Natural Science Foundation of China (Grant No. 51632006).

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References

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Cited By

图 1 (a)六方相MnTe的晶体结构; (b)基板温度为280 ℃ , Sb₂Te₃∶Te = 1∶1条件下生长Sb₂Te₃缓冲层的RHEED图谱; (c)基板温度为280 ℃ , Mn∶Te = 1∶9条件下生长的MnTe薄膜的RHEED图谱; (d), (e)不同基板温度和不同Mn∶Te束流比工艺下生长的MnTe薄膜的XRD图谱

Figure 1. (a) Crystal structure of hexagonal MnTe; RHEED patterns of (b) Sb₂Te₃ buffer layer grown at T_sub = 280 ℃ and Sb₂Te₃∶Te = 1∶1 and (c) MnTe film grown at T_sub = 280 ℃ and Mn∶Te = 1∶9; XRD patterns of MnTe thin films grown at (d) different T_sub and (e) under different Mn∶Te ratios.

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图 2 不同基板温度下生长的MnTe薄膜的XPS能谱　(a) Mn 2p轨道; (b) Te 3d轨道. 不同Mn∶Te束流比下生长的MnTe薄膜的XPS能谱 (c) Mn 2p轨道;(d) Te 3d轨道

Figure 2. XPS spectra of MnTe films grown under different T_sub∶ (a) Mn 2p; (b) Te 3d. XPS spectra of MnTe films grown under different Mn∶Te ratios∶ (c) Mn 2p; (d) Te 3d.

DownLoad: Full-Size Img PowerPoint

图 3 不同基板温度下生长的MnTe薄膜的原子尺度分辨STM形貌图　(a)T_sub = 260 ℃; (b)T_sub = 280 ℃; (c)—(f)暗凹陷点缺陷与暗三角形缺陷在正负偏压下的STM形貌图; (g) MnTe晶体结构沿c轴的截面图, 其中黄红色粗线条用于示意第二层点缺陷的局域电子态在表面的投影

Figure 3. Atomic resolution STM images of MnTe films grown at different T_sub: (a) T_sub = 260 ℃; (b) T_sub = 280 ℃. (c)–(f) STM images of the dark depressions point defect and dark triangle defect under positive and negative STM tip bias. (g) A cross-sectional sketch of the MnTe crystal structure along the c axis, in which the thick yellow-red line is used to indicate the projection of the local electronic state on the surface from the second layer point defects.

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图 4 (a)固定Mn∶Te = 1∶6, 在不同T_sub条件下生长的MnTe薄膜的室温空穴浓度与载流子迁移率; 不同T_sub条件下生长的MnTe薄膜的(b)电导率、(c)Seebeck系数和(d)功率因子随温度的变化关系

Figure 4. Room temperature (a) hole concentration and (p) carrier mobility (μ) of MnTe thin films grown at different T_sub. The temperature dependence of (b) electrical conductivity , (c) Seebeck coefficient and (d) power factor for these MnTe films grown at different T_sub.

DownLoad: Full-Size Img PowerPoint

图 5 (a)固定T_sub = 280 ℃, 不同Mn∶Te束流比条件下生长的MnTe薄膜的室温空穴浓度与载流子迁移率; 不同T_sub条件下生长的MnTe薄膜的(b)电导率、(c)Seebeck系数和(d)功率因子随温度的变化关系

Figure 5. Room temperature (a) hole concentration and (p) carrier mobility (μ) of MnTe thin films grown at different T_sub. The temperature dependence of (b) electrical conductivity, (c) Seebeck coefficient and (d) power factor for these MnTe films grown at different T_sub.

DownLoad: Full-Size Img PowerPoint

图 6 MnTe材料中(a)室温电导率、(b)室温Seebeck系数随载流子浓度的变化关系以及文献块体MnTe报道结果

Figure 6. Carrier density dependence of the (a) electrical conductivity and (b) Seebeck coefficient for MnTe films at room temperature, and the comparison with reported results.

DownLoad: Full-Size Img PowerPoint

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[2]	陈立东, 刘睿恒, 史迅 2018 热电材料与器件 (北京: 科学出版社) 第16—39页 Chen L D, Liu H R, Si X 2018 Thermoelectric Materials and Devices (Beijing: Science Press) pp16–39 (in Chinese)
[3]	Xu Y, Li W, Wang C, Li J, Chen Z, Lin S, Chen Y, Pei Y 2017 J. Mater. Chem. A 5 19143 Google Scholar
[4]	Zhao L D, Kanatzidis M G 2016 J. Materiomics 2 101 Google Scholar
[5]	Du B S, Jian J K, Liu H T, Liu J, Qiu L 2018 Chin. Phys. B 27 048102 Google Scholar
[6]	王步升, 刘永 2016 物理学报 65 066101 Google Scholar Wang B S, Yong L 2016 Acta Phys. Sin. 65 066101 Google Scholar
[7]	Kriegner D, Reichlova H, Grenzer J, Schmidt W, Ressouche E, Godinho J, Wagner T, Martin S, Shick A, Volobuev V 2017 Phys. Rev. B 96 214418 Google Scholar
[8]	Ren Y, Jiang Q, Zhang D, Zhou Z, Li X, Xin J, He X 2017 J. Mater. Chem. C 5 5076 Google Scholar
[9]	娄许诺, 邓后权, 李爽, 张青堂, 熊文杰, 唐国栋 2021 无机材料学报 36(3) Lou X N, Deng H Q, Li S, Zhang Q T, Xiong W J, Tang G D 2021 J. Inorg. Mater. 36 (in Chinese)
[10]	Deng H, Lou X, Lu W, Zhang J, Li D, Li S, Zhang Q, Zhang X, Chen X, Zhang D 2020 Nano Energy 81 105649
[11]	Sreeram P, Ganesan V, Thomas S, Anantharaman M 2020 J. Alloys Compd. 836 155374 Google Scholar
[12]	Basit A, Yang J, Jiang Q, Zhou Z, Xin J, Li X, Li S 2019 J. Alloys Compd. 777 968 Google Scholar
[13]	Ren Y, Jiang Q, Yang J, Luo Y, Zhang D, Cheng Y, Zhou Z 2016 J. Materiomics 2 172 Google Scholar
[14]	Xin J, Yang J, Jiang Q, Li S, Basit A, Hu H, Long Q, Li S, Li X 2019 Nano Energy 57 703 Google Scholar
[15]	Dong J, Sun F H, Tang H, Hayashi K, Li H, Shang P P, Miyazaki Y, Li J F 2019 ACS Appl. Mater. Interfaces 11 28221 Google Scholar
[16]	Dong J, Pei J, Hayashi K, Saito W, Li H, Cai B, Miyazaki Y, Li J F 2021 J. Materiomics 7 577 Google Scholar
[17]	Zhang M, Liu W, Zhang C, Xie S, Li Z, Hua F, Luo J, Wang Z, Wang W, Yan F, Cao Y, Liu Y, Wang Z, Uher C, Tang X 2021 ACS Nano 15 5706 Google Scholar
[18]	Watanabe R, Yoshimi R, Shirai M, Tanigaki T, Kawamura M, Tsukazaki A, Takahashi K, Arita R, Kawasaki M, Tokura Y 2018 Appl. Phys. Lett. 113 181602 Google Scholar
[19]	Su S H, Chang J T, Chuang P Y, Tsai M C, Peng Y W, Lee M K, Cheng C M, Huang J C 2021 Nanomaterials 11 3322 Google Scholar
[20]	He Q L, Yin G, Grutter A J, Pan L, Che X, Yu G, Gilbert D A, Disseler S M, Liu Y, Shafer P, Zhang B, Wu Y, Kirby B J, Arenholz E, Lake R K, Han X, Wang K L 2018 Nat. Commun. 9 2767 Google Scholar
[21]	Aliev Z S, Amiraslanov I R, Nasonova D I, Shevelkov A V, Abdullayev N A, Jahangirli Z A, Orujlu E N, Otrokov M M, Mamedov N T, Babanly M B, Chulkov E V 2019 J. Alloys Compd. 789 443 Google Scholar
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[27]	Iwanowski R J, Heinonen M H, Witkowska B 2010 J. Alloys Compd. 491 13 Google Scholar
[28]	吴海飞, 张寒洁, 廖清, 陆豪, 斯剑霄, 李海洋, 鲍世宁, 吴惠祯, 何丕模 2009 物理学报 58 1310 Google Scholar Wu H F, Zhang H J, Liao Q, Lu H, Si J X, Li H Y, Bao S N, Wu H Z, He P M 2009 Acta Phys. Sin. 58 1310 Google Scholar
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[30]	Gong Y, Guo J, Li J, Zhu K, Liao M, Liu X, Zhang Q, Gu L, Tang L, Feng X, Zhang D, Li W, Song C, Wang L, Yu P, Chen X, Wang Y, Yao H, Duan W, Xu Y, Zhang S C, Ma X, Xue Q K, He K 2019 Chin. Phys. Lett. 36 076801 Google Scholar
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[32]	Zhang M, Liu W, Zhang C, Qiu J, Xie S, Hua F, Cao Y, Li Z, Xie H, Uher C 2020 Appl. Phys. Lett. 117 153902 Google Scholar
[33]	逯旭, 侯绩翀, 张强, 樊建锋, 陈少平, 王晓敏 2021 无机材料学报 36 Lu X, Hou J C, Zhang Q, Fan J F, Chen S P, Wang X M 2021 J. Inorg. Mater. 36 (in Chinese)
[34]	Bahk J H, Shakouri A 2016 Phys. Rev. B 93 165209 Google Scholar
[35]	Zhang Q, Hou J, Fan J, Chen S, Fan W, Zhang H, Wang W, Wu Y, Xu B 2020 Phys. Chem. Chem. Phys. 22 7012 Google Scholar

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