Power Factor Enhancement by Modulation Doping in Bulk Nanocomposites

被引：454

作者：

Zebarjadi, Mona ^{[2
]}

Joshi, Giri ^{[1
]}

Zhu, Gaohua ^{[1
]}

Yu, Bo ^{[1
]}

Minnich, Austin ^{[2
]}

Lan, Yucheng ^{[1
]}

Wang, Xiaowei ^{[1
]}

Dresselhaus, Mildred ^{[3
,4
]}

Ren, Zhifeng ^{[1
]}

Chen, Gang ^{[2
]}

机构：

[1] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[2] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

[3] MIT, Dept Phys, Cambridge, MA 02139 USA

[4] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

来源：

NANO LETTERS | 2011年 / 11卷 / 06期

关键词：

Electrical transport; thermoelectrics; modulation doping; nanocomposites; HIGH-THERMOELECTRIC PERFORMANCE; FIGURE-OF-MERIT; PBTE;

D O I：

10.1021/nl201206d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We introduce the concept of modulation doping in three-dimensional nanostructured bulk materials to increase the thermoelectric figure of merit. Modulation-doped samples are made of two types of nanograins (a two-phase composite), where dopants are incorporated only into one type. By band engineering, charge carriers could be separated from their parent grains and moved into undoped grains, which would result in enhanced mobility of the carriers in comparison to uniform doping due to a reduction of ionized impurity scattering. The electrical conductivity of the two-phase composite can exceed that of the individual components, leading to a higher power factor. We here demonstrate the concept via experiment using composites made of doped silicon nanograins and intrinsic silicon germanium grains.

引用

页码：2225 / 2230

页数：6

共 36 条

[1] Exploring Resonance Levels and Nanostructuring in the PbTe-CdTe System and Enhancement of the Thermoelectric Figure of Merit
Ahn, Kyunghan
Han, Mi-Kyung
He, Jiaqing
Androulakis, John
Ballikaya, Sedat
Uher, Ctirad
Dravid, Vinayak P.
Kanatzidis, Mercouri G.
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2010, 132 (14) : 5227 - 5235
[2] THERMOELECTRIC PROPERTIES OF A COMPOSITE MEDIUM
BERGMAN, DJ
LEVY, O
[J]. JOURNAL OF APPLIED PHYSICS, 1991, 70 (11) : 6821 - 6833
[3] Thermal conductivity and ballistic-phonon transport in the cross-plane direction of superlattices
Chen, G
[J]. PHYSICAL REVIEW B, 1998, 57 (23): : 14958 - 14973
[4] Daembkes H., 1991, MODULATION DOPED FIE
[5] ELECTRON MOBILITIES IN MODULATION-DOPED SEMICONDUCTOR HETEROJUNCTION SUPER-LATTICES
DINGLE, R
STORMER, HL
GOSSARD, AC
WIEGMANN, W
[J]. APPLIED PHYSICS LETTERS, 1978, 33 (07) : 665 - 667
[6] Theory of enhancement of thermoelectric properties of materials with nanoinclusions
Faleev, Sergey V.
Leonard, Francois
[J]. PHYSICAL REVIEW B, 2008, 77 (21)
[7] Enhancement of thermoelectric efficiency in PbTe by distortion of the electronic density of states
Heremans, Joseph P.
Jovovic, Vladimir
Toberer, Eric S.
Saramat, Ali
Kurosaki, Ken
Charoenphakdee, Anek
Yamanaka, Shinsuke
Snyder, G. Jeffrey
[J]. SCIENCE, 2008, 321 (5888) : 554 - 557
[8] Thermopower enhancement in PbTe with pb precipitates
Heremans, JP
Thrush, CM
Morelli, DT
[J]. JOURNAL OF APPLIED PHYSICS, 2005, 98 (06)
[9] EFFECT OF QUANTUM-WELL STRUCTURES ON THE THERMOELECTRIC FIGURE OF MERIT
HICKS, LD
DRESSELHAUS, MS
[J]. PHYSICAL REVIEW B, 1993, 47 (19): : 12727 - 12731
[10] Cubic AgPbmSbTe2+m:: Bulk thermoelectric materials with high figure of merit
Hsu, KF
Loo, S
Guo, F
Chen, W
Dyck, JS
Uher, C
Hogan, T
Polychroniadis, EK
Kanatzidis, MG
[J]. SCIENCE, 2004, 303 (5659) : 818 - 821

← 1 2 3 4 →