Effects of Intermixing in Sb2Te3/Ge1+xTe Multilayers on the Thermoelectric Power Factor

被引:1
作者
Zhang, Heng [1 ]
Ahmadi, Majid [1 ]
Ginanjar, Wastu Wisesa [1 ]
Blake, Graeme R. [1 ]
Kooi, Bart J. [1 ]
机构
[1] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands
关键词
pulsed laser deposition; thermoelectric power factor; Sb2Te3; Ge1+xTe multilayer; intermixing; EDX mapping; QUANTUM-WELL STRUCTURES; FIGURE; MERIT; FILM; CONDUCTION; TRANSPORT; TELLURIDE;
D O I
10.1021/acsami.3c00869
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Over the past few decades, telluride-based chalcogenide multilayers, such as PbSeTe/PbTe, Bi2Te3/Sb2Te3, and Bi2Te3/Bi2Se3, were shown to be promising high-performance thermoelectric films. However, the stability of performance in operating environments, in particular, influenced by intermixing of the sublayers, has been studied rarely. In the present work, the nanostructure, thermal stability, and thermoelectric power factor of Sb2Te3/Ge1+xTe multilayers prepared by pulsed laser deposition are investigated by transmission electron microscopy and Seebeck coefficient/electrical conductivity measurements performed during thermal cycling. Highly textured Sb2Te3 films show p-type semiconducting behavior with superior power factor, while Ge1+xTe films exhibit n-type semiconducting behavior. The elemental mappings indicate that the as-deposited multilayers have welldefined layered structures. Upon heating to 210 degrees C, these layer structures are unstable against intermixing of sublayers; nanostructural changes occur on initial heating, even though the highest temperature is close to the deposition temperature. Furthermore, the diffusion is more extensive at domain boundaries leading to locally inclined structures there. The Sb2Te3 sublayers gradually dissolve into Ge1+xTe. This dissolution depends markedly on the relative Ge1+xTe film thickness. Rather, full dissolution occurs rapidly at 210 degrees C when the Ge1+xTe sublayer is substantially thicker than that of Sb2Te3, whereas the dissolution is very limited when the Ge1+xTe sublayer is substantially thinner. The resulting variations of the nanostructure influence the Seebeck coefficient and electrical conductivity and thus the power factor in a systematic manner. Our results shed light on a previously unreported correlation of the power factor with the nanostructural evolution of unstable telluride multilayers.
引用
收藏
页码:22672 / 22683
页数:12
相关论文
共 49 条
[1]   Engineering Interfacial Effects in Electron and Phonon Transport of Sb2Te3/MoS2 Multilayer for Thermoelectric ZT Above 2.0 [J].
Ahmad, Mujeeb ;
Agarwal, Khushboo ;
Munoz, Sergio Gonzalez ;
Ghosh, Abhishek ;
Kodan, Nisha ;
Kolosov, Oleg Victor ;
Mehta, Bodh Raj .
ADVANCED FUNCTIONAL MATERIALS, 2022, 32 (49)
[2]   Periodic Modulation of Sb Stoichiometry in Bi2Te3/Bi2-xSbxTe3 Multi layers Using Pulsed Electrodeposition [J].
Banga, Dhego ;
Lensch-Falk, Jessica L. ;
Medlin, Douglas L. ;
Stavila, Vitalie ;
Yang, Nancy Y. C. ;
Robinson, David B. ;
Sharma, Peter A. .
CRYSTAL GROWTH & DESIGN, 2012, 12 (03) :1347-1353
[3]   Dilute Cu2Te-alloying enables extraordinary performance of r-GeTe thermoelectrics [J].
Bu, Z. ;
Li, W. ;
Li, J. ;
Zhang, X. ;
Mao, J. ;
Chen, Y. ;
Pei, Y. .
MATERIALS TODAY PHYSICS, 2019, 9
[4]   Dynamics of GeSbTe phase-change nanoparticles deposited on graphene [J].
Chen, Bin ;
Do, Van Lam ;
ten Brink, Gert ;
Palasantzas, George ;
Rudolf, Petra ;
Kooi, Bart J. .
NANOTECHNOLOGY, 2018, 29 (50)
[5]   Double-layered GeTe/Sb2Te heterostructures for enhancing thermoelectric performance [J].
Chen, Yingqi ;
Shen, Xinkai ;
Liu, Fen ;
Wang, Guoxiang ;
Lotnyk, Andriy .
SCRIPTA MATERIALIA, 2022, 218
[6]  
Dankwort T., PHYS STATUS SOLIDI A
[7]   Enhanced Thermoelectric Transport and Stability in Atomic Layer Deposited-HfO2/ZnO and TiO2/ZnO-Sandwiched Multilayer Thin Films [J].
Felizco, Jenichi ;
Juntunen, Taneli ;
Uenuma, Mutsunori ;
Etula, Jarkko ;
Tossi, Camilla ;
Ishikawa, Yasuaki ;
Tittonen, Ilkka ;
Uraoka, Yukiharu .
ACS APPLIED MATERIALS & INTERFACES, 2020, 12 (43) :49210-49218
[8]   Confinement- and strain-induced enhancement of thermoelectric properties in LaNiO3/LaAlO3 (001) superlattices [J].
Geisler, Benjamin ;
Pentcheva, Rossitza .
PHYSICAL REVIEW MATERIALS, 2018, 2 (05)
[9]   The n- and p-type thermoelectricity property of GeTe by first-principles study [J].
Guo, Donglin ;
Li, Chunhong ;
Qiu, Kebin ;
Yang, Qiqi ;
Li, Kejian ;
Shao, Bin ;
Chen, Dengming ;
Ma, Yilong ;
Sun, Jianchun ;
Cao, Xianlong ;
Zeng, Wen ;
Wang, Zhongchang ;
Xie, Rufeng .
JOURNAL OF ALLOYS AND COMPOUNDS, 2019, 810
[10]   Synthesis and Thermal Instability of High-Quality Bi2Te3/Sb2Te3 Super lattice Thin Film Thermoelectrics [J].
Hansen, Anna-Lena ;
Dankwort, Torben ;
Winkler, Markus ;
Ditto, Jeffrey ;
Johnson, Dave C. ;
Koenig, Jan D. ;
Bartholome, Kilian ;
Kienle, Lorenz ;
Bensch, Wolfgang .
CHEMISTRY OF MATERIALS, 2014, 26 (22) :6518-6522