Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization-Delocalization Transition in n-Type Bi-Doped PbTe/Ag2Te Nanocomposite

被引:90
作者
Lee, Min Ho [1 ,2 ,3 ]
Yun, Jae Hyun [1 ,2 ]
Kim, Gareoung [1 ,2 ]
Lee, Ji Eun [4 ]
Park, Su-Dong [4 ]
Reith, Heiko [3 ]
Schierning, Gabi [3 ]
Nielsch, Konelius [3 ]
Ko, Wonhee [5 ]
Li, An-Ping [5 ]
Rhyee, Jong-Soo [1 ,2 ]
机构
[1] Kyung Hee Univ, Dept Appl Phys, Yongin 17104, South Korea
[2] Kyung Hee Univ, Inst Nat Sci, Yongin 17104, South Korea
[3] Leibniz Inst Solid State & Mat Res, Helmholtzstr 20, D-01069 Dresden, Germany
[4] Korea Electrotechnol Res Inst, Thermoelect Convers Res Ctr, Chang Won 51543, South Korea
[5] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37830 USA
关键词
thermoelectric; bulk composite; Anderson localization; thermal conductivity; figure-of-merit; LATTICE THERMAL-CONDUCTIVITY; FIGURE-OF-MERIT; BAND CONVERGENCE; PBTE; TRANSPORT; NANOPARTICLES; SCATTERING; EFFICIENCY; DISTORTION; NANO;
D O I
10.1021/acsnano.8b08579
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Considerable efforts have been devoted to enhancing thermoelectric performance, by employing phonon scattering from nanostructural architecture, and material design using phonon-glass and electron-crystal concepts. The nanostructural approach helps to lower thermal conductivity but has limited effect on the power factor. Here, we demonstrate selective charge Anderson localization as a route to maximize the Seebeck coefficient while simultaneously preserving high electrical conductivity and lowering the lattice thermal conductivity. We confirm the viability of interface potential modification in an n-type Bi-doped PbTe/Ag2Te nanocomposite and the resulting enhancement in thermoelectric figure-of-merit ZT. The introduction of random potentials via Ag2Te nanoparticle distribution using extrinsic phase mixing was determined using scanning tunneling spectroscopy measurements. When the Ag2Te undergoes a structural phase transition (T > 420 K) from monoclinic beta-Ag2Te to cubic alpha-Ag2Te, the band gap in the alpha-Ag2Te increases due to the p-d hybridization. This results in a decrease in the potential barrier height, which gives rise to partial delocalization of the electrons, while wave packets of the holes are still in a localized state. Using this strategic approach, we achieved an exceptionally high thermoelectric figure-of-merit in n-type PbTe materials, a ZT greater than 2.0, suitable for waste heat power generation.
引用
收藏
页码:3806 / 3815
页数:10
相关论文
共 51 条
[1]   ABSENCE OF DIFFUSION IN CERTAIN RANDOM LATTICES [J].
ANDERSON, PW .
PHYSICAL REVIEW, 1958, 109 (05) :1492-1505
[2]   Resonant carrier scattering by core-shell nanoparticles for thermoelectric power factor enhancement [J].
Bahk, Je-Hyeong ;
Santhanam, Parthiban ;
Bian, Zhixi ;
Ram, Rajeev ;
Shakouri, Ali .
APPLIED PHYSICS LETTERS, 2012, 100 (01)
[3]   Thermoelectric power factor enhancement by ionized nanoparticle scattering [J].
Bahk, Je-Hyeong ;
Bian, Zhixi ;
Zebarjadi, Mona ;
Santhanam, Parthiban ;
Ram, Rajeev ;
Shakouri, Ali .
APPLIED PHYSICS LETTERS, 2011, 99 (07)
[4]   THE APPLICATION OF ONSAGERS RECIPROCAL RELATIONS TO THERMOELECTRIC, THERMOMAGNETIC, AND GALVANOMAGNETIC EFFECTS [J].
CALLEN, HB .
PHYSICAL REVIEW, 1948, 73 (11) :1349-1358
[5]   Significant enhancement of the dimensionless thermoelectric figure of merit of the binary Ag2Te [J].
Capps, J. ;
Drymiotis, F. ;
Lindsey, S. ;
Tritt, T. M. .
PHILOSOPHICAL MAGAZINE LETTERS, 2010, 90 (09) :677-681
[6]   Electronic structure, localization, and spin-state transition in Cu-substituted FeSe:Fe1-xCuxSe [J].
Chadov, Stanislav ;
Schaumlrf, Daniel ;
Fecher, Gerhard H. ;
Felser, Claudia ;
Zhang, Lijun ;
Singh, David J. .
PHYSICAL REVIEW B, 2010, 81 (10)
[7]   FUNDAMENTAL OPTICAL ABSORPTION IN BETA-SILVER TELLURIDE [J].
DALVEN, R .
PHYSICAL REVIEW LETTERS, 1966, 16 (08) :311-&
[8]   UNIVERSALITY ASPECTS OF METAL-NONMETAL TRANSITION IN CONDENSED MEDIA [J].
EDWARDS, PP ;
SIENKO, MJ .
PHYSICAL REVIEW B, 1978, 17 (06) :2575-2581
[9]   High thermoelectric performance due to nanoinclusions and randomly distributed interface potentials in N-type (PbTe0.93-xSe0.07Clx)0.93(PbS)0.07 composites [J].
Ginting, Dianta ;
Lin, Chan-Chieh ;
Rathnam, Lydia ;
Yun, Jae Hyun ;
Yu, Byung-Kyu ;
Kim, Sung-Jin ;
Rhyee, Jong-Soo .
JOURNAL OF MATERIALS CHEMISTRY A, 2017, 5 (26) :13535-13543
[10]   High thermoelectric performance in pseudo quaternary compounds of (PbTe)0.95-x(PbSe)x(PbS)0.05 by simultaneous band convergence and nano precipitation [J].
Ginting, Dianta ;
Lin, Chan-Chieh ;
Lydia, R. ;
So, Hyeon Seob ;
Lee, Hosun ;
Hwang, Junpil ;
Kim, Woochul ;
Al Orabi, Rabih Al Rahal ;
Rhyee, Jong-Soo .
ACTA MATERIALIA, 2017, 131 :98-109