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Enhanced asymmetrical transport of carriers induced by local structural distortion in chemically tuned titania: A possible mechanism for enhancing thermoelectric properties
Liu, C.1,2; Miao, L.1; Hu, D.3; Huang, R.4; Fisher, C. A. J.5; Tanemura, S.1,5,6; Gu, H.3
2013-11-07
Source PublicationPHYSICAL REVIEW B
Volume88Issue:20
AbstractOptimizing all three thermoelectric properties (Seebeck coefficient, electrical conductivity, and thermal conductivity) simultaneously is a nontrivial task, especially for the Seebeck coefficient and electrical conductivity. Here, we demonstrate that chemically tuned rutile TiO2 sintered from N- and Nb-codoped nanoparticles possesses not only an enhanced power factor but also a decreased thermal conductivity. In samples produced under strongly reducing conditions, the electrical resistivity is decreased markedly to 3.96 x 10(-5) Omega m while maintaining a high Seebeck coefficient. In this manner, the power factor can be greatly improved to 9.87 x 10(-4) W m(-1) K-2 at 785 degrees C with a significantly enhanced figure of merit ZT of 0.35 at 700 degrees C. Theoretical modeling based on density functional theory suggests that enhanced asymmetrical carrier transport (i.e., with the minority carrier relatively localized on one side of the Fermi level but the majority carrier delocalized on the other) can be induced by locally distorting the crystal structure, since this imposes local perturbations on the intrinsic periodic potential field, which may be responsible for the improved power factor. The greatly improved thermoelectric behavior of chemically tuned rutile TiO2 provides a promising route to producing practical thermoelectric materials without the use of toxic heavy elements. Our findings also provide a promising new strategy for enhancing the thermoelectric properties of other thermoelectric materials.
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1103/PhysRevB.88.205201
WOS Subject ExtendedPhysics
WOS KeywordTHERMAL-CONDUCTIVITY ; RUTILE TIO2 ; ELECTRONIC-STRUCTURE ; ANATASE TIO2 ; PERFORMANCE ; DIOXIDE ; OXIDES ; MERIT ; METAL ; POWER
Indexed BySCI
Language英语
WOS SubjectPhysics, Condensed Matter
WOS IDWOS:000326821200001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/9088
Collection中国科学院广州能源研究所
太阳能系统应用实验室
Affiliation1.Chinese Acad Sci, Key Lab Renewable Energy, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, State Key Lab High Performance Ceram & Superfine, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
4.E China Normal Univ, Key Lab Polarized Mat & Devices, Minist Educ, Shanghai 200062, Peoples R China
5.Japan Fine Ceram Ctr, Atsuta Ku, Nagoya, Aichi 4568587, Japan
6.Nagoya Inst Technol, Powder Technol Project Lab, Showa Ku, Nagoya, Aichi 4668555, Japan
Recommended Citation
GB/T 7714
Liu, C.,Miao, L.,Hu, D.,et al. Enhanced asymmetrical transport of carriers induced by local structural distortion in chemically tuned titania: A possible mechanism for enhancing thermoelectric properties[J]. PHYSICAL REVIEW B,2013,88(20).
APA Liu, C..,Miao, L..,Hu, D..,Huang, R..,Fisher, C. A. J..,...&Gu, H..(2013).Enhanced asymmetrical transport of carriers induced by local structural distortion in chemically tuned titania: A possible mechanism for enhancing thermoelectric properties.PHYSICAL REVIEW B,88(20).
MLA Liu, C.,et al."Enhanced asymmetrical transport of carriers induced by local structural distortion in chemically tuned titania: A possible mechanism for enhancing thermoelectric properties".PHYSICAL REVIEW B 88.20(2013).
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