Enhancement of the thermoelectric performance of bulk SnTe alloys via the synergistic effect of band structure modification and chemical bond softening

2017 ◽  
Vol 5 (27) ◽  
pp. 14165-14173 ◽  
Author(s):  
Hongchao Wang ◽  
Junphil Hwang ◽  
Chao Zhang ◽  
Teng Wang ◽  
Wenbin Su ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Band Structure ◽  
Seebeck Coefficient ◽  
Effective Mass ◽  
Chemical Bond ◽  
Resonance Level ◽  
Thermoelectric Performance ◽  
Energy Separation ◽  
Structure Modification ◽  
Bond Softening

Seebeck coefficient of SnTe is largely enhanced by large band effective mass or decrease of energy separation through synergistic effect including resonance level and band convergence.

An enhanced Seebeck coefficient and high thermoelectric performance in p-type In and Mg co-doped Sn1−xPbxTe via the co-adjuvant effect of the resonance level and heavy hole valence band

2017 ◽  
Vol 5 (23) ◽  
pp. 5737-5748 ◽  
Author(s):  
Subhajit Roychowdhury ◽  
U. Sandhya Shenoy ◽  
Umesh V. Waghmare ◽  
Kanishka Biswas
Keyword(s):  
Synergistic Effect ◽  
Seebeck Coefficient ◽  
Valence Band ◽  
Heavy Hole ◽  
Resonance Level ◽  
Thermoelectric Performance ◽  
Adjuvant Effect ◽  
P Type ◽  
Co Doped

Remarkable enhancement of the Seebeck coefficient of an Sn rich Sn1−xPbxTe system due to the synergistic effect of resonance level formation and valence band convergence.

Band structure modification of the thermoelectric Heusler-phase TiFe2Sn via Mn substitution

2017 ◽  
Vol 19 (28) ◽  
pp. 18273-18278 ◽  
Author(s):  
Tianhua Zou ◽  
Tiantian Jia ◽  
Wenjie Xie ◽  
Yongsheng Zhang ◽  
Marc Widenmeyer ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Band Structure ◽  
Seebeck Coefficient ◽  
Fermi Level ◽  
Density Of States ◽  
Effective Strategy ◽  
Structure Modification ◽  
Electronic Density ◽  
Heusler Phase ◽  
Mn Substitution

Doping (or substitution)-induced modification of the electronic structure to increase the electronic density of states (eDOS) near the Fermi level is considered as an effective strategy to enhance the Seebeck coefficient, and may consequently boost the thermoelectric performance.

scholarly journals Thermoelectric enhancement in sliver tantalate via strain-induced band modification and chemical bond softening

RSC Advances ◽  
2017 ◽  
Vol 7 (14) ◽  
pp. 8460-8466 ◽  
Author(s):  
Jun Li ◽  
Zuju Ma ◽  
Kechen Wu
Keyword(s):  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Valence Band ◽  
Chemical Bond ◽  
Bond Softening

Herein, we report the strain-induced enhancement of the Seebeck coefficient, caused by valence band modification and thermal conductivity reduction due to bond softening.

Anion exchanged Cl doping achieving the band sharpening and low lattice thermal conductivity for improving thermoelectric performance in SnTe

2021 ◽  
Author(s):  
Quanxin Yang ◽  
Tu Lyu ◽  
Yuan Dong ◽  
Bohang Nan ◽  
Jian Tie ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Band Structure ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance ◽  
Structure Modification

Band structure modification plays an important role in improving thermoelectric performance of SnTe. Herein the band sharpening as one of band structure modifications is achieved by Cl doping reduces the...

High Power Factor and Enhanced Thermoelectric Performance of SnTe-AgInTe2: Synergistic Effect of Resonance Level and Valence Band Convergence

2016 ◽  
Vol 138 (39) ◽  
pp. 13068-13075 ◽  
Author(s):  
Ananya Banik ◽  
U. Sandhya Shenoy ◽  
Sujoy Saha ◽  
Umesh V. Waghmare ◽  
Kanishka Biswas
Keyword(s):  
Synergistic Effect ◽  
Valence Band ◽  
Power Factor ◽  
High Power ◽  
Resonance Level ◽  
Thermoelectric Performance ◽  
High Power Factor

scholarly journals Enhanced thermoelectric performance in Sb–Br codoped Bi2Se3 with complex electronic structure and chemical bond softening

RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1653-1662
Author(s):  
Ju Zhang ◽  
Shiqi Zhong ◽  
San-Huang Ke
Keyword(s):  
Electronic Structure ◽  
Charge Density ◽  
Chemical Bond ◽  
Density Difference ◽  
Thermoelectric Performance ◽  
Charge Density Difference ◽  
Bond Softening

A detailed description of the charge density difference of BiSb(Se0.92Br0.08)3.

Cobalt-doping in Cu2SnS3: enhanced thermoelectric performance by synergy of phase transition and band structure modification

2017 ◽  
Vol 5 (44) ◽  
pp. 23267-23275 ◽  
Author(s):  
Huiwen Zhao ◽  
Xiaoxuan Xu ◽  
Chao Li ◽  
Ruoming Tian ◽  
Ruizhi Zhang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Band Structure ◽  
Thermoelectric Material ◽  
Thermoelectric Performance ◽  
Cobalt Doping ◽  
Structure Modification ◽  
Ternary Sulfide ◽  
P Type

Mohite-type ternary sulfide Cu2SnS3, which has been intensively studied in the photovoltaic field, has recently attracted much attention as an outstanding p-type eco-friendly thermoelectric material.

scholarly journals Impact of Fermi Surface Shape Engineering on Calculated Electronic Transport Properties of Bi-Sb-Te

2021 ◽  
Vol 59 (1) ◽  
pp. 54-60
Author(s):  
Sang-il Kim ◽  
Jong-Chan Lim ◽  
Heesun Yang ◽  
Hyun-Sik Kim
Keyword(s):  
Electrical Conductivity ◽  
Fermi Surface ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Effective Mass ◽  
Power Factor ◽  
Electronic Transport ◽  
Surface Shape ◽  
Thermoelectric Performance ◽  
Electronic Transport Properties

Using thermoelectric refrigerators can address climate change because they do not utilize harmful greenhouse gases as refrigerants. To compete with current vapor compression cycle refrigerators, the thermoelectric performance of materials needs to be improved. However, improving thermoelectric performance is challenging because of the trade-off relationship between the Seebeck coefficient and electrical conductivity. Here, we demonstrate that decreasing conductivity effective mass by engineering the shape of the Fermi surface pocket (non-parabolicity factor) can decouple electrical conductivity from the Seebeck coefficient. The effect of engineering the non-parabolicity factor was shown by calculating the electronic transport properties of a state-of-the-art Bi-Sb-Te ingot via two-band model with varying non-parabolicity. The power factor (the product of the Seebeck coefficient squared and electrical conductivity) was calculated to be improved because of enhanced electrical conductivity, with an approximately constant Seebeck coefficient, using a non-parabolicity factor other than unity. Engineering the non-parabolicity factor to achieve lighter conductivity effective mass can improve the electronic transport properties of thermoelectric materials because it only improves electrical conductivity without decreasing the Seebeck coefficient (which is directly proportional to the band mass of a single Fermi surface pocket and not to the conductivity effective mass). Theoretically, it is demonstrated that a thermoelectric figure-of-merit <i>zT</i> higher than 1.3 can be achieved with a Bi-Sb-Te ingot if the non-parabolicity factor is engineered to be 0.2. Engineering the non-parabolicity factor is another effective band engineering approach, similar to band convergence, to achieve an effective improvement in power factor.

High thermoelectric performance in Te-free (Bi,Sb)2Se3via structural transition induced band convergence and chemical bond softening

2016 ◽  
Vol 9 (11) ◽  
pp. 3436-3447 ◽  
Author(s):  
Shanyu Wang ◽  
Yongxing Sun ◽  
Jiong Yang ◽  
Bo Duan ◽  
Lihua Wu ◽  
...  
Keyword(s):  
Chemical Bond ◽  
Structural Transition ◽  
Phonon Scattering ◽  
Thermoelectric Performance ◽  
Electronic Band ◽  
Bond Softening

In Te-free (Bi,Sb)2Se3, structural transition induced electronic band convergence and intensified phonon scattering triple the thermoelectric ZT to 1.0.

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