Electron-doped SrTiO is a well-known -type thermoelectric material, although the figure of merit of SrTiO is still inferior compared with -type metal oxide-based thermoelectric materials due to its high lattice thermal conductivity. In this study, we have used a different amount of the non-ionic surfactant F127 during sample preparation to introduce nanoscale porosities into bulk samples of La-doped SrTiO. It has been observed that the porosities introduced into the bulk sample significantly improve the Seebeck coefficient and reduce the thermal conductivity by the charge carrier and phonon scattering respectively. Therefore, there is an overall enhancement in the power factor (PF) followed by a dimensionless figure of merit () over a wide scale of temperature. The sample 20 at% La-doped SrTiO with 600 mg of F127 surfactant (SLTO 600F127) shows the maximum PF of 1.14 mW m K at 647 K which is 35% higher than the sample without porosity (SLTO 0F127), and the same sample (SLTO 600F127) shows the maximum value of z is 0.32 at 968 K with an average enhancement of 62% in in comparison with the sample without porosity (SLTO 0F127).
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6837226 | PMC |
| http://dx.doi.org/10.1098/rsos.190870 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Laser-induced transverse voltage effect in-axis inclined LaSrTiOthin films prepared by MOCVD.
Nanotechnology
April 2024
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, People's Republic of China.
Light and thermal detectors based on the laser-induced transverse voltage (LITV) effect have garnered significant interest for their rapid and broad spectral response. In this study, we prepared the La-doped SrTiO(STO) epitaxial thin films on the 12° inclined single crystal LaAlO(LAO) (100) substrates using our home-designed metal-organic chemical vapor deposition system. Under the illumination of a 248 nm laser, the LITV signals of LaSrTiOfilms were observed and showed dependence on the La doping level, which can be explained by the changes in the light absorption coefficient, thermal conductivity, and optical penetration depth.
View Article and Find Full Text PDFStabilizing Perovskite Pb(MgNb)O-PbTiO Thin Films by Fast Deposition and Tensile Mismatched Growth Template.
ACS Appl Mater Interfaces
March 2024
MESA+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente, Enschede 7500 AE, Netherlands.
Because of its low hysteresis, high dielectric constant, and strong piezoelectric response, Pb(MgNb)O-PbTiO (PMN-PT) thin films have attracted considerable attention for the application in PiezoMEMS, field-effect transistors, and energy harvesting and storage devices. However, it remains a great challenge to fabricate phase-pure, pyrochlore-free PMN-PT thin films. In this study, we demonstrate that a high deposition rate, combined with a tensile mismatched template layer can stabilize the perovskite phase of PMN-PT films and prevent the nucleation of passive pyrochlore phases.
View Article and Find Full Text PDFPotential of La-Doped SrTiO Thin Films Grown by Metal-Organic Vapor Phase Epitaxy for Thermoelectric Applications.
Cryst Growth Des
April 2023
Leibniz-Institut für Kristallzüchtung, Max-Born-Straße 2, 12489 Berlin, Germany.
La-doped SrTiO thin films with high structural quality were homoepitaxially grown by the metal-organic vapor phase epitaxy (MOVPE) technique. Thermogravimetric characterization of the metal-organic precursors determines suitable flash evaporator temperatures for transferring the liquid source materials in the gas phase of the reactor chamber. An adjustment of the charge carrier concentration in the films, which is necessary for optimizing the thermoelectric power factor, was performed by introducing a defined amount of the metal-organic compound La(tmhd) and tetraglyme to the liquid precursor solution.
View Article and Find Full Text PDFControlling the Thermoelectric Behavior of La-Doped SrTiO through Processing and Addition of Graphene Oxide.
ACS Appl Mater Interfaces
December 2022
Department of Materials, University of Manchester, Oxford Road, ManchesterM13 9PL, U.K.
The addition of graphene has been reported as a potential route to enhance the thermoelectric performance of SrTiO. However, the interplay between processing parameters and graphene addition complicates understanding this enhancement. Herein, we examine the effects of processing parameters and graphene addition on the thermoelectric performance of La-doped SrTiO (LSTO).
View Article and Find Full Text PDFEffect of Threading Dislocations on the Electronic Structure of La-Doped BaSnO Thin Films.
Materials (Basel)
March 2022
Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea.
In spite of great application potential as transparent -type oxides with high electrical mobility at room temperature, threading dislocations (TDs) often found in the (Ba,La)SnO (BLSO) films can limit their intrinsic properties so that their role in the physical properties of BLSO films need to be properly understood. The electrical properties and electronic structure of BLSO films grown on SrTiO (001) (STO) and BaSnO (001) (BSO) substrates are comparatively studied to investigate the effect of the TDs. In the BLSO/STO films with TD density of ~1.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!