scholarly journals Contrasting Thermoelectric Transport Behaviors of p-Type PbS Caused by Doping Alkali Metals (Li and Na)

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Zhenghao Hou ◽  
Dongyang Wang ◽  
Jinfeng Wang ◽  
Guangtao Wang ◽  
Zhiwei Huang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Transport Properties ◽  
Power Factor ◽  
Electrical Transport ◽  
Alkali Metals ◽  
Low Cost ◽  
Average Power ◽  
Total Thermal Conductivity ◽  
Electrical Transport Properties ◽  
Thermoelectric Transport

PbS is a latent substitute of PbTe thermoelectric materials, which is on account of its superiority in low cost and earth abundance. Here, the thermoelectric transport properties of p-type PbS by doping alkali metals (Na and Li) are investigated and it is verified that Li is a more effective dopant than Na. By introducing Li, the electrical and thermal transport properties were optimized collectively. The electrical transport properties were boosted remarkably via adjusting carrier concentration, and the maximum power factor (PFmax) of ~11.5 μW/cmK2 and average power factor (PFave) ~9.9 μW/cmK2 between 423 and 730 K in Pb0.99Li0.01S were achieved, which are much higher than those (~9.5 and ~7.7 μW/cmK2) of Pb0.99Na0.01S. Doping Li and Na can weaken the lattice thermal conductivity effectively. Combining the enlarged PF with suppressed total thermal conductivity, a maximum ZT ~0.5 at 730 K and a large average ZT ~0.4 at 423-730 K were obtained in p-type Pb0.99Li0.01S, which are higher than ~0.4 and ~0.3 in p-type Pb0.99Na0.01S, respectively.

Designing Si/Si1−xGex Superlattices With Tailored Thermal Transport Properties

2008 ◽  
Author(s):  
E. S. Landry ◽  
A. J. H. McGaughey
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Transport Properties ◽  
Electrical Transport ◽  
Design Space ◽  
Phonon Transport ◽  
Atomistic Modeling ◽  
Electrical Transport Properties ◽  
Modeling Tools ◽  
Thermoelectric Energy

Si/Si1−xGex superlattices are promising candidates for thermoelectric energy conversion applications [1, 2], as the phonon transport through them can be inhibited while maintaining desirable electrical transport properties. No comprehensive experimental study has been performed to map the thermal conductivity design space accessible by Si/Ge nanocomposites. By using atomistic modeling tools, interesting areas of the design space can be identified and then further explored experimentally.

Reinvestigation the Thermal and Electrical Transport Properties of Tl7Sb2

2013 ◽  
Vol 802 ◽  
pp. 284-288
Author(s):  
Anek Charoenphakdee ◽  
Adul Harnwangmuang ◽  
Tosawat Seetawan ◽  
Chesta Ruttanapun ◽  
Vittaya Amornkitbamrung ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Transport Properties ◽  
Electrical Transport ◽  
Room Temperature ◽  
Lattice Parameter ◽  
Electronic Contribution ◽  
Electrical Transport Properties ◽  
Space Group ◽  
Crystal System ◽  
Thallium Compounds

The authors examined the thermal and electrical transport properties of Tl7Sb2 at temperatures ranging from room temperature to 400 K. The crystal system of Tl7Sb2 is cubic with the lattice parameter a = 1.16053 nm and the space group is Im3m. The polycrystalline samples were prepared by melting stoichiometric amounts of thallium and antimony. Although, usually the thermal conductivity of thallium compounds is very low (<1 Wm-1K-1), that of Tl7Sb2 was relatively high (~13 Wm-1K-1 at room temperature). This is because of the large electronic contribution to the thermal conductivity.

Electronic structure and electrical transport properties of MoS2 single-walled nanotubes based on first principles

2021 ◽  
Author(s):  
Wen Yang ◽  
Lili Wang ◽  
Yiming Mi ◽  
Guanghong Zhong ◽  
Qiuju Ma ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Transport Properties ◽  
Power Factor ◽  
Electrical Transport ◽  
Maximum Power ◽  
Boltzmann Transport ◽  
Electrical Transport Properties ◽  
Text Type ◽  
Maximum Power Factor ◽  
Transport Method

The work theoretically calculated the electronic structure and electrical transport properties of two configurations of single-walled MoS2 nanotubes: armchair nanotubes (ANTs) and zigzag nanotubes (ZNTs) based on the density functional theory and Boltzmann transport method. ANTs have an indirect one. while ZNTs have a direct bandgap structure. The Seebeck coefficient ([Formula: see text]), electrical conductivity ([Formula: see text] and power factor ([Formula: see text] were calculated as a function of carrier concentration, chemical potential and temperature using the Boltzmann transport method. The calculated power factor ([Formula: see text]) indicates that the most promising electronic properties were exhibited by [Formula: see text]-type ANTs and [Formula: see text]-type ZNTs. The [Formula: see text] of narrow bandgap (6, 6) (7, 7) (8, 8) semiconductors reached [Formula: see text], [Formula: see text] and [Formula: see text]WK[Formula: see text]m[Formula: see text] at room-temperature, respectively. (7, 7) nanotube have a maximum power factor of [Formula: see text]WK[Formula: see text]m[Formula: see text] at 950 K, and the maximum power factor of ANTs is almost twice that of ZNTs.

High Temperature Electrical Transport Properties of Eu and Yb-doped Skutterudites

2001 ◽  
Vol 691 ◽  
Author(s):  
R. H. Tedstrom ◽  
G. A. Lamberton ◽  
Terry M. Tritt ◽  
G. S. Nolas
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Power Factor ◽  
Electrical Transport ◽  
Measurement Techniques ◽  
The Novel ◽  
Electrical Transport Properties ◽  
Novel Structure ◽  
High Power Factor ◽  
Sample Measurement

ABSTRACTSkutterudites are a class of materials that show promise for thermoelectric applications due to their high power factor and the ability to “tune” the thermal conductivity due to the addition of “rattling” atoms into the novel structure of these materials. Thermopower and resistivity is measured and reported for a series of Eu and Yb-doped skutterudites over a temperature range of approximately 100 K – 700 K using the High Temperature Thermoelectric Probe. Sample measurement techniques are briefly discussed. Data from various dopings is presented and compared in hope of showing trends that point towards improvements in these skutterudites.

scholarly journals Highly Textured N-Type SnSe Polycrystals with Enhanced Thermoelectric Performance

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Peng-Peng Shang ◽  
Jinfeng Dong ◽  
Jun Pei ◽  
Fu-Hua Sun ◽  
Yu Pan ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Transport Properties ◽  
Electrical Transport ◽  
High Performance ◽  
Waste Heat ◽  
Thermoelectric Performance ◽  
Electrical Transport Properties ◽  
Anisotropic Thermal Conductivity ◽  
Out Of Plane ◽  
Thermoelectric Transport Properties

Thermoelectric materials, which directly convert heat into electricity based on the Seebeck effects, have long been investigated for use in semiconductor refrigeration or waste heat recovery. Among them, SnSe has attracted significant attention due to its promising performance in both p-type and n-type crystals; in particular, a higher out-of-plane ZT value could be achieved in n-type SnSe due to its 3D charge and 2D phonon transports. In this work, the thermoelectric transport properties of n-type polycrystalline SnSe were investigated with an emphasis on the out-of-plane transport through producing textural microstructure. The textures were fabricated using mechanical alloying and repeated spark plasma sintering (SPS), as a kind of hot pressing, aimed at producing strong anisotropic transports in n-type polycrystalline SnSe as that in crystalline SnSe. Results show that the lowest thermal conductivity of 0.36 Wm-1 K-1 was obtained at 783 K in perpendicular to texture direction. Interestingly, the electrical transport properties are less anisotropic and even nearly isotropic, and the power factors reach 681.3 μWm-1 K-2 at 783 K along both parallel and perpendicular directions. The combination of large isotropic power factor and low anisotropic thermal conductivity leads to a maximum ZT of 1.5 at 783 K. The high performance elucidates the outstanding electrical and thermal transport behaviors in n-type polycrystalline SnSe, and a higher thermoelectric performance can be expected with future optimizing texture in n-type polycrystalline SnSe.

ELECTRICAL TRANSPORT IN ORGANIC SEMICONDUCTORS

2001 ◽  
Vol 11 (02) ◽  
pp. 585-615 ◽  
Author(s):  
I. H. CAMPBELL ◽  
D. L. SMITH
Keyword(s):  
Transport Properties ◽  
Organic Semiconductors ◽  
Electrical Transport ◽  
Disordered Systems ◽  
Carrier Transport ◽  
Low Cost ◽  
Electrical Transport Properties ◽  
Large Area ◽  
And Performance ◽  
Neighboring Sites

Organic semiconductors have processing and performance advantages for low cost and/or large area applications that have led to their rapid commercialization. Organic semiconductors are π conjugated materials, either small molecules or polymers. Their electrical transport properties are fundamentally distinct from those of inorganic semiconductors. Organic semiconductor thin films are amorphous or polycrystalline and their electronic structures consist of a distribution of localized electronic states with different energies. The localized sites are either individual molecules or isolated conjugated segments of a polymer chain. Electrical transport results from carrier hopping between neighboring sites. At room temperature, equilibration between neighboring sites of different energy is fast enough that carrier transport can be described using a mobility picture. Hopping transport in these disordered systems leads to a mobility that can depend strongly on both the electric field and carrier density. This article presents experimental measurements and theoretical analysis of the electrical transport properties of representative organic semiconductors.

Remarkable electron and phonon band structures lead to a high thermoelectric performance ZT > 1 in earth-abundant and eco-friendly SnS crystals

2018 ◽  
Vol 6 (21) ◽  
pp. 10048-10056 ◽  
Author(s):  
Wenke He ◽  
Dongyang Wang ◽  
Jin-Feng Dong ◽  
Yang Qiu ◽  
Liangwei Fu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Transport Properties ◽  
Electrical Transport ◽  
Figure Of Merit ◽  
Thermoelectric Performance ◽  
Electrical Transport Properties ◽  
Band Structures ◽  
Low Thermal Conductivity ◽  
Earth Abundant ◽  
High Figure

Enhanced electrical transport properties and low thermal conductivity lead to high figure of merit (ZT) over the whole temperature range in Na-doped SnS crystals.

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