Thermoelectric Properties of Lead Chalcogenide Core–Shell Nanostructures

Scheele, Marcus; Oeschler, N.; Veremchuk, Igor; Peters, Sven-Ole; Littig, Alexander; Kornowski, Andreas; Klinke, Christian; Weller, Horst

doi:10.1021/nn2017183

Cited by 114 publications

(117 citation statements)

References 46 publications

Supporting

Mentioning

105

Contrasting

Order By: Relevance

“…The preserved quantum confinement and nanostructure with subphonon wavelength grain sizes hold for additional improvements of the Seebeck coefficient and reduction of thermal conductivity. 16,17 We would like to emphasize that the procedure presented here does not involve annealing in air or other less controlled oxidation techniques applied previously. 6,18 Rather, the carrier concentration is fixed after brief exposure (∼3 s) to the ligand exchange solution.…”

Section: Discussionmentioning

confidence: 99%

Nonmonotonic Size Dependence in the Hole Mobility of Methoxide-Stabilized PbSe Quantum Dot Solids

et al. 2013

Self Cite

View full text Add to dashboard Cite

We present a facile procedure to fabricate p-type PbSe-based quantum dot solids with mobilities as large as 0.3 cm2 V–1 s–1. Upon partial ligand exchange of oleate-capped PbSe quantum dots with the methoxide ion, we observe a pronounced red shift in the excitonic transition in conjunction with a large increase in conductivity. We show that there is little correlation between these two phenomena and that the electronic coupling energy in PbSe quantum dot solids is much smaller than often assumed. However, we observe for the first time a nonmonotonic size dependence of the hole mobility, illustrating that coupling can nonetheless be dominant in determining the transport characteristics. We attribute these effects to a decrease in charging energy and interparticle spacing, leading to enhanced electronic coupling on one hand and enhanced dipole interactions on the other hand, which is held responsible for the majority of the red shift.

show abstract

Section: Discussionmentioning

confidence: 99%

Nonmonotonic Size Dependence in the Hole Mobility of Methoxide-Stabilized PbSe Quantum Dot Solids

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, the large surface area of nanograins also provides a high density of trap states (or an energy barrier) caused by surface adsorbents. [28] The electrical conductivity could decrease, however, due to the filtering effect and scattering at grain boundaries. Therefore, there is a trade-off between the benefits from EFE and the detrimental effects from the nanostructure.…”

Section: Thermoelectric Performance Ofmentioning

confidence: 99%

Thermoelectric Enhancement of Different Kinds of Metal Chalcogenides

Han

Sun

et al. 2016

Advanced Energy Materials

173

114

View full text Add to dashboard Cite

Due to the urgency of our energy and environmental issues, a variety of cost-effective and pollution-free technologies have attracted considerable attention, among which thermoelectric technology has made enormous progress. Substantial numbers of new thermoelectric materials are created with high figure of merit (ZT) by using advanced nanoscience and nanotechnology. This is especially true in the case of metalchalcogenide-based materials, which possess both relatively high ZT and low cost among all the different kinds of thermoelectric materials. Here, comprehensive coverage of recent advances in metal chalcogenides and their correlated thermoelectric enhancement mechanisms are provided. Several new strategies are summarized with the hope that they can inspire further enhancement of performance, both in metal chalcogenides and in other materials. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsHan, C., Sun, Q., Li, Z. & Dou, S. X. (2016) Several new strategies are summarized with the hope that they can inspire further enhancement of performance, both in metal chalcogenides and in other materials.2

show abstract

“…One is to enhance the Seebeck coefficient or the PF using band structure engineering methods, [5] such as modifying the electronic density of states and Fermi energy through doping heteroatoms, reducing crystal symmetry to achieve high band edge degeneracy, [6][7][8] etc. The other is to reduce thermal conductivity using methods such as nanostructuring, [9][10][11][12][13][14][15][16][17][18][19][20][21] alloying, [14,[22][23][24][25][26] etc. These strategies have achieved significant progress in the past decade.…”

mentioning

confidence: 99%

Chemical Trends of Electronic Properties of Two-Dimensional Halide Perovskites and Their Potential Applications for Electronics and Optoelectronics

2016

View full text Add to dashboard Cite

Current thermoelectric (TE) materials often have low performance or contain less abundant and/or toxic elements, thus limiting their large-scale applications. Therefore, new TE materials with high efficiency and low cost are strongly desirable. Here we demonstrate that, SiS and SiSe monolayers made from non-toxic and earth-abundant elements intrinsically have low thermal conductivities arising from their low-frequency optical phonon branches with large overlaps with acoustic phonon modes, which is similar to the state-of-the-art experimentally demonstrated material SnSe with a layered structure. Together with high thermal power factors due to their two-dimensional nature, they show promising TE performances with large figure of merit (ZT) values exceeding 1 or 2 over a wide range of temperatures. We establish some basic understanding of identifying layered materials with low thermal conductivities, which can guide and stimulate the search and study of other layered materials for TE applications.2 Thermoelectric materials have great potential for novel energy and environmental applications and have been extensively studied recently. The performance of a TE material is usually evaluated by the dimensionless figure of merit, which is denoted as ZT and defined as ZT = (S / ) , where S, σ, κ and T are the Seebeck coefficient, the electrical conductivity, the thermal conductivity (including both electronic contribution and lattice contribution ), and the average working temperature, respectively. [1][2][3][4] The product S σ is also known as the power factor (PF). To be an ideal TE material with high heat-to-electric conversion efficiency, a high ZT value, i.e., larger than unity, is required.Currently, two strategies are usually considered to enhance ZT of a TE material. One is to enhance the Seebeck coefficient or the PF using band structure engineering methods, [5] such as modifying the electronic density of states and Fermi energy through doping heteroatoms, reducing crystal symmetry to achieve high band edge degeneracy, [6][7][8] etc. The other is to reduce thermal conductivity using methods such as nanostructuring, [9][10][11][12][13][14][15][16][17][18][19][20][21] alloying, [14,[22][23][24][25][26] etc. These strategies have achieved significant progress in the past decade. However, most of now-existing TE materials, including PbTe, Bi 2 Te 3 and complex structure based TE materials, [3] strongly rely on heavy elements and/or rare-earth metals, which often have low abundance or are toxic, [3] thus limiting the large-scale employment of TE materials. Consequently, it will be of great importance to explore new TE materials not only with a high maximum ZT over a wide range of temperatures, but also made from non-toxic and earth-abundant elements.Recently, those materials with layered structures have shown such promise. As an experimentally demonstrated state-of-the-art thermoelectric material, SnSe has a simple layered structure similar to black phosphorus and only contains earth-abundant and non-toxic ...

show abstract

Thermoelectric Properties of Lead Chalcogenide Core–Shell Nanostructures

Cited by 114 publications

References 46 publications

Nonmonotonic Size Dependence in the Hole Mobility of Methoxide-Stabilized PbSe Quantum Dot Solids

Nonmonotonic Size Dependence in the Hole Mobility of Methoxide-Stabilized PbSe Quantum Dot Solids

Thermoelectric Enhancement of Different Kinds of Metal Chalcogenides

Chemical Trends of Electronic Properties of Two-Dimensional Halide Perovskites and Their Potential Applications for Electronics and Optoelectronics

Contact Info

Product

Resources

About