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Tailoring Nanoporous Structures in Bi2Te3 Thin Films for Improved Thermoelectric Performance
Qiao, Jixiang; Zhao, Yang; Jin, Qun; Tang, Jun; Kang, Siqing; Qiu, Jianhang; Tai, Kaiping
2019-10-16
Source PublicationACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
Volume11Issue:41Pages:38075-38083
AbstractThin-film thermoelectrics (TEs) with unique advantages have triggered great interest in thermal management and energy harvesting technology for ambient temperature microscale systems. Although they have exhibited a good prospect, their unsatisfactory performances still seriously hamper their widespread application. Tailoring the porous structure has been demonstrated to be a facile strategy to significantly reduce thermal conductivity and enhance the figure of merit (ZT) of bulk TE materials; however, it is challenging for thin-film TEs. Here, the nanoporous Bi2Te3 thin films with faceted pore shapes and various porosities, pore sizes, and pore intervals are carefully designed and fabricated by evacuating the over-stoichiometry Te atoms. The dependence of the carrier mobility and lattice thermal conductivity on the pore characteristics is investigated. In the case of the pore interval longer than the electron mean free path, the porous structure greatly reduces the lattice thermal conductivity without affecting the electrical conductivity obviously. Phonon specular backscattering that is highly related to the pore characteristics is suggested to be mainly responsible for thermal conductivity reduction, resulting in similar to 60% enhancement in ZT at room temperature, that is, from similar to 0.42 for the dense film to similar to 0.67 for the nanoporous film. The enhanced ZT value is comparable to that of commercial bulk TEs and can be further improved by optimizing the carrier concentrations. This work provides a general approach to fabricate high-performance chalcogenide TE thin-film materials.
Keywordthin film thermoelectrics nanoporous structure pore interval Bi2Te3 phonon backscattering
Indexed BySCI
Language英语
WOS IDWOS:000491219700075
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80693
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Qiao, Jixiang,Zhao, Yang,Jin, Qun,et al. Tailoring Nanoporous Structures in Bi2Te3 Thin Films for Improved Thermoelectric Performance[J]. ACS APPLIED MATERIALS & INTERFACES,2019,11(41):38075-38083.
APA Qiao, Jixiang.,Zhao, Yang.,Jin, Qun.,Tang, Jun.,Kang, Siqing.,...&Tai, Kaiping.(2019).Tailoring Nanoporous Structures in Bi2Te3 Thin Films for Improved Thermoelectric Performance.ACS APPLIED MATERIALS & INTERFACES,11(41),38075-38083.
MLA Qiao, Jixiang,et al."Tailoring Nanoporous Structures in Bi2Te3 Thin Films for Improved Thermoelectric Performance".ACS APPLIED MATERIALS & INTERFACES 11.41(2019):38075-38083.
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