Growth dynamics of epitaxiai （Ba, Sr）TiO3 thin films deposited at different temperatures on SrRuO3/SrTiO3 substrates by pulsed laser deposition is investigated by transmission electron microscopy. The films exhibit ...Growth dynamics of epitaxiai （Ba, Sr）TiO3 thin films deposited at different temperatures on SrRuO3/SrTiO3 substrates by pulsed laser deposition is investigated by transmission electron microscopy. The films exhibit a layered structure comprising sublayers with distinctive features in regard to the remaining strain, density of misfit dislocations and/or lattice defects, and growth habit. We correlate these temperature-dependent features with the predominant misfit-strain relaxation mechanisms for each one of the detected growth regimes. The thickness dependence of the film structure is discussed within the framework of the predictions for a kineticaily modified Stranski-Krastanov growth mode.展开更多
Thermoelectric technologies,which generate electricity directly from waste heat,have received considerable attention because of their potential to improve overall energy efficiency[1].The energy conversion efficiency ...Thermoelectric technologies,which generate electricity directly from waste heat,have received considerable attention because of their potential to improve overall energy efficiency[1].The energy conversion efficiency is evaluated by a dimensionless figure-of-merit,defined as ZT=α^(2)σT/κ,whereα,σ,T,andκare the Seebeck coefficient,electrical conductivity,absolute temperature,and thermal conductivity,respectively.展开更多
基金Supported by the National Natural Science Foundation of China and the Spanish Education and Science Ministry under the Ramón y Cajal Programme.
文摘Growth dynamics of epitaxiai （Ba, Sr）TiO3 thin films deposited at different temperatures on SrRuO3/SrTiO3 substrates by pulsed laser deposition is investigated by transmission electron microscopy. The films exhibit a layered structure comprising sublayers with distinctive features in regard to the remaining strain, density of misfit dislocations and/or lattice defects, and growth habit. We correlate these temperature-dependent features with the predominant misfit-strain relaxation mechanisms for each one of the detected growth regimes. The thickness dependence of the film structure is discussed within the framework of the predictions for a kineticaily modified Stranski-Krastanov growth mode.
基金the financial support of the National Natural Science Foundation of China(52222209,11934007,and 52002167)the Science and Technology Innovation Committee Foundation of Shenzhen(JCYJ20220530165000001 and JCYJ20200109141205978)+2 种基金the Young Elite Scientists Sponsorship Program by CAST(2021QNRC001)the Outstanding Talents Training Fund in Shenzhen(202108)the Natural Science Foundation of Sichuan(2023NSFSC0953)。
文摘Thermoelectric technologies,which generate electricity directly from waste heat,have received considerable attention because of their potential to improve overall energy efficiency[1].The energy conversion efficiency is evaluated by a dimensionless figure-of-merit,defined as ZT=α^(2)σT/κ,whereα,σ,T,andκare the Seebeck coefficient,electrical conductivity,absolute temperature,and thermal conductivity,respectively.
