Enhanced thermoelectric figure-of-merit of p-type SiGe through TiO2 nanoinclusions and modulation doping of boron

被引：23

作者：

Ahmad, Sajid ^{[1
,2
]}

Basu, Ranita ^{[1
]}

Sarkar, Pritam ^{[1
]}

Singh, Ajay ^{[1
,3
]}

Bohra, Anil ^{[1
]}

Bhattacharya, Shovit ^{[1
]}

Bhatt, Ranu ^{[1
]}

Meshram, K. N. ^{[1
]}

Samanta, Soumen ^{[1
]}

Bhatt, Pramod ^{[4
]}

Navaneethan, M. ^{[5
]}

Hayakawa, Y. ^{[5
]}

Debnath, A. K. ^{[1
]}

Gupta, S. K. ^{[1
]}

Aswal, D. K. ^{[1
,6
]}

Muthe, K. P. ^{[1
]}

Gadkari, S. C. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Tech Phys Div, Mumbai 400085, Maharashtra, India

[2] Bhabha Atom Res Ctr, Nucl Res Lab, Srinagar 190024, India

[3] Homi Bhabha Natl Inst, Mumbai 400094, Maharashtra, India

[4] Bhabha Atom Res Ctr, Div Solid State Phys, Mumbai 400085, Maharashtra, India

[5] Shizuoka Univ, Elect Res Inst, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan

[6] CSIR Natl Phys Lab, New Delhi, India

来源：

MATERIALIA | 2018年 / 4卷

关键词：

Thermoelectrics; Thermal conductivity; Modulation doping; Energy-filtering interface; Nanoinclusions; Phonon scattering;

D O I：

10.1016/j.mtla.2018.09.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermoelectric performance of p-type SiGe is usually inferior as compared to the n-type SiGe. In this work, we demonstrate that by in-situ creation of coherent TiO2 nanoinclusions and boron rich regions in p-type SiGe, a high figure-of-merit of similar to 1.3 is achieved at 1100 K, which is 29% higher than pristine p-type SiGe. Such a composite material (SiGe-TiO2) with improved performance was synthesized through vacuum hot pressing of p-type SiGe and TiB2 nanopowders. The phonon scattering and energy filtering of charge carriers at the TiO2/SiGe coherent interface together resulted in lowering of thermal conductivity and enhancement of the Seebeck coefficient. Modulation doping of boron along with improved densification maintain high electrical conductivity. Such a unique combinations of low thermal conductivity, high Seebeck coefficient, and high electrical conductivity of SiGe-TiO2 composite are responsible for the improvement of the thermoelectric figure-of-merit.

引用

页码：147 / 156

页数：10

共 41 条

[1] Boosting thermoelectric performance of p-type SiGe alloys through in-situ metallic YSi2 nanoinclusions [J].

Ahmad, Sajid ;

Singh, Ajay ;

Bohra, Anil ;

Basu, Ranita ;

Bhattacharya, Shovit ;

Bhatt, Ranu ;

Meshram, K. N. ;

Roy, Mainak ;

Sarkar, Shaibal K. ;

Hayakawa, Y. ;

Debnath, A. K. ;

Aswal, D. K. ;

Gupta, S. K. .

NANO ENERGY, 2016, 27 :282-297

[2]

[Anonymous], 1995, HDB XRAY PHOTOELECTR

[3] Key issues in development of thermoelectric power generators: High figure-of-merit materials and their highly conducting interfaces with metallic interconnects [J].

Aswal, Dinesh K. ;

Basu, Ranita ;

Singh, Ajay .

ENERGY CONVERSION AND MANAGEMENT, 2016, 114 :50-67

[4] Improved thermoelectric performance of hot pressed nanostructured n-type SiGe bulk alloys [J].

Basu, Ranita ;

Bhattacharya, Shovit ;

Bhatt, Ranu ;

Roy, Mainak ;

Ahmad, Sajid ;

Singh, Ajay ;

Navaneethan, M. ;

Hayakawa, Y. ;

Aswal, D. K. ;

Gupta, S. K. .

JOURNAL OF MATERIALS CHEMISTRY A, 2014, 2 (19) :6922-6930

[5] The role of nanoscale defect features in enhancing the thermoelectric performance of p-type nanostructured SiGe alloys [J].

Bathula, Sivaiah ;

Jayasimhadri, M. ;

Gahtori, Bhasker ;

Singh, Niraj Kumar ;

Tyagi, Kriti ;

Srivastava, A. K. ;

Dhar, Ajay .

NANOSCALE, 2015, 7 (29) :12474-12483

[6] Enhanced thermoelectric figure-of-merit in spark plasma sintered nanostructured n-type SiGe alloys [J].

Bathula, Sivaiah ;

Jayasimhadri, M. ;

Singh, Nidhi ;

Srivastava, A. K. ;

Pulikkotil, Jiji ;

Dhar, Ajay ;

Budhani, R. C. .

APPLIED PHYSICS LETTERS, 2012, 101 (21)

[7] Flexo-green Polypyrrole - Silver nanocomposite films for thermoelectric power generation [J].

Bharti, Meetu ;

Singh, Ajay ;

Samanta, Soumen ;

Debnath, A. K. ;

Aswal, D. K. ;

Muthe, K. P. ;

Gadkari, S. C. .

ENERGY CONVERSION AND MANAGEMENT, 2017, 144 :143-152

[8] Thermal conductivity and ballistic-phonon transport in the cross-plane direction of superlattices [J].

Chen, G .

PHYSICAL REVIEW B, 1998, 57 (23) :14958-14973

[9] Enhanced performance of dye-sensitized solar cell using Bi2Te3 nanotube/ZnO nanoparticle composite photoanode by the synergistic effect of photovoltaic and thermoelectric conversion [J].

Dou, Yuanyao ;

Wu, Fang ;

Fang, Liang ;

Liu, Gaobin ;

Mao, Caiying ;

Wan, Kai ;

Zhou, Miao .

JOURNAL OF POWER SOURCES, 2016, 307 :181-189

[10]

Easterling K.E., 1981, PHASE TRANSFORMATION

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