7. Carrier energy filtering effect in thermoelectric materials

2020 ◽  
pp. 145-160
Keyword(s):  
Thermoelectric Materials ◽  
Energy Filtering ◽  
Carrier Energy ◽  
Filtering Effect

Enhanced thermoelectric performance via carrier energy filtering effect in β-Zn4Sb3 alloy bulk embedded with (Bi2Te3)0.2(Sb2Te3)0.8

2014 ◽  
Vol 115 (5) ◽  
pp. 053710 ◽  
Author(s):  
T. H. Zou ◽  
X. Y. Qin ◽  
D. Li ◽  
B. J. Ren ◽  
G. L. Sun ◽  
...  
Keyword(s):  
Thermoelectric Performance ◽  
Energy Filtering ◽  
Carrier Energy ◽  
Filtering Effect

scholarly journals Preparation and Characterization of Thermoelectric PEDOT/Te Nanorod Array Composite Films

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 148
Author(s):  
Hong-Ju Ahn ◽  
Seil Kim ◽  
Kwang Ho Kim ◽  
Joo-Yul Lee
Keyword(s):  
Composite Film ◽  
High Performance ◽  
Electrochemical Polymerization ◽  
Composite Films ◽  
Lithium Perchlorate ◽  
Nanorod Array ◽  
Energy Filtering ◽  
Carrier Energy ◽  
Galvanic Displacement Reaction ◽  
Filtering Effect

In this study, we prepared Te nanorod arrays via a galvanic displacement reaction (GDR) on a Si wafer, and their composite with poly(3,4-ethylenedioxythiophene) (PEDOT) were successfully synthesized by electrochemical polymerization with lithium perchlorate (LiClO4) as a counter ion. The thermoelectric performance of the composite film was optimized by adjusting the polymerization time. As a result, a maximum power factor (PF) of 235 µW/mK2 was obtained from a PEDOT/Te composite film electrochemically polymerized for 15 s at room temperature, which was 11.7 times higher than that of the PEDOT film, corresponding to a Seebeck coefficient (S) of 290 µV/K and electrical conductivity (σ) of 28 S/cm. This outstanding PF was due to the enhanced interface interaction and carrier energy filtering effect at the interfacial potential barrier between the PEDOT and Te nanorods. This study demonstrates that the combination of an inorganic Te nanorod array with electrodeposited PEDOT is a promising strategy for developing high-performance thermoelectric materials.

Tuning SnSe/SnS hetero-interfaces to enhance thermoelectric performance

2018 ◽  
Vol 11 (04) ◽  
pp. 1850069 ◽  
Author(s):  
Xuerui Liu ◽  
Shuankui Li ◽  
Tinyang Liu ◽  
Weiming Zhu ◽  
Rui Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Multiple Scales ◽  
Phonon Transport ◽  
Thermoelectric Performance ◽  
Energy Filtering ◽  
Promising Strategy ◽  
Filtering Effect ◽  
Heterogeneous Nanostructure

With the development of nanotechnology, thermoelectric materials with complex heterogeneous nanostructure offer a promising approach to improve the thermoelectric performance. In this work, SnSe/SnS hetero-nanosheet was tuned by the epitaxial growth of SnSe on the few layers of SnS nanosheets. The heterojunction interface can optimize the carrier/phonon transport behavior by energy filtering effect and scattering the phonon in multiple scales. Compared with pristine SnSe, the power factor of SnSe/SnS hetero-nanosheet increases from 2.2[Formula: see text][Formula: see text]V/cmK2 to 3.21[Formula: see text][Formula: see text]V/cmK2 at 773[Formula: see text]K, whereas the thermal conductivity decreases significantly from 0.65[Formula: see text]W[Formula: see text][Formula: see text][Formula: see text]m[Formula: see text] to 0.48[Formula: see text]W[Formula: see text][Formula: see text][Formula: see text]m[Formula: see text] at 773[Formula: see text]K. The maximum ZT of 0.5 is obtained at 773[Formula: see text]K in the SnSe/SnS hetero-nanosheets, which is 89% higher than pristine SnSe. This approach is proved to be a promising strategy to design high performance thermoelectric materials.

scholarly journals Enhanced thermoelectric performance of Bi–Sb–Te/Sb2O3 nanocomposites by energy filtering effect

2018 ◽  
Vol 6 (43) ◽  
pp. 21341-21349 ◽  
Author(s):  
Amir Pakdel ◽  
Quansheng Guo ◽  
Valeria Nicolosi ◽  
Takao Mori
Keyword(s):  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Performance ◽  
Energy Filtering ◽  
Filtering Effect

24 month high-ZT stability of Bi0.5Sb1.5Te3/Sb2O3 nanocomposites that demonstrate simultaneous Seebeck coefficient enhancement and thermal conductivity decline through energy filtering effect.

Evaluation of energy filtering effect from first principles calculations

2016 ◽  
Vol 213 (12) ◽  
pp. 3250-3253 ◽  
Author(s):  
Xi Zhao ◽  
Xiu-hong Zhu ◽  
Rui-zhi Zhang
Keyword(s):  
First Principles ◽  
First Principles Calculations ◽  
Energy Filtering ◽  
Filtering Effect

Enhanced thermoelectric properties in nanowires of InAs modulated with multiple-stub structures

2019 ◽  
Vol 9 (5) ◽  
pp. 498-502
Author(s):  
Changning Pan ◽  
Jun He ◽  
Zhiming Liu ◽  
Kaixing Shi
Keyword(s):  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Thermal Conductance ◽  
Volume Ratio ◽  
Electronic Density ◽  
Energy Filtering ◽  
Carrier Energy ◽  
Inas Nanowires ◽  
Scattering Matrix Method ◽  
Phonon Thermal Conductance

The thermoelectric properties of InAs nanowires modulated with the multiple-stub structures are studied using the scattering-matrix method. Owing to the very large surface-to-volume ratio, both the phonon and electron transport sensitively depend on the geometric structure. Carrier energy filtering which locally distorts electronic density of states strongly enhances the thermopower. Thus optimized thermopower, together with the significant reduction of the phonon thermal conductance, yields the high thermoelectric figure of merit ZT to 0.3∼1.9.

Enhanced Thermopower via Carrier Energy Filtering in Solution-Processable Pt–Sb2Te3Nanocomposites

Nano Letters ◽  
2011 ◽  
Vol 11 (7) ◽  
pp. 2841-2844 ◽  
Author(s):  
Dong-Kyun Ko ◽  
Yijin Kang ◽  
Christopher B. Murray
Keyword(s):  
Energy Filtering ◽  
Carrier Energy ◽  
Solution Processable
Sign in / Sign up

Export Citation Format

Share Document