dc.contributor.author | Yelgel, Övgü Ceyda | |
dc.date.accessioned | 2020-12-19T19:48:59Z | |
dc.date.available | 2020-12-19T19:48:59Z | |
dc.date.issued | 2017 | |
dc.identifier.issn | 0021-8979 | |
dc.identifier.issn | 1089-7550 | |
dc.identifier.uri | https://doi.org/10.1063/1.4974463 | |
dc.identifier.uri | https://hdl.handle.net/11436/2202 | |
dc.description | WOS: 000393476900018 | en_US |
dc.description.abstract | Mg2X (X = Si, Ge) compounds are promising thermoelectric materials for middle temperature applications due to good thermoelectric properties, nontoxicity, and abundantly available constituent elements. So far, these materials used in applications have all been in bulk form. Herein we report a full theory of thermoelectric transport properties of 3D bulk and 2D quantum well systems. the main aim of this present work is to show the effect of quantum confinement on the enhancement of the thermoelectric figure of merit theoretically. Results are given for n-type Mg2Si0.5Ge0.5 solid solutions and n-type Mg2Si/Mg2Ge/Mg2Si quantum well systems where the values of well widths are taken as 10 nm, 15 nm, and 20 nm, respectively. the n-type doping is made by using Sb- and La-elements as dopants. Experimental results for solid solutions are included to provide demonstration of proof of principle for the theoretical model applied for 3D bulk structures. the maximum thermoelectric figure of merits of LaxMg2-xSi0.49Ge0.5Sb0.01 solid solutions are obtained to be 0.64 and 0.56 at 800K for x = 0 and x = 0.01 sample, respectively. While, at the same temperature, due to the relatively low phonon thermal conductivity the state-of-the-art ZT values of 2.41 and 2.26 have been attained in the Mg2Si/Mg2Ge/Mg2Si quantum well samples with 0.01 wt. % Sb-doped and 0.01 wt. % Sb- and 0.01 wt. % La-doped, respectively. Published by AIP Publishing. | en_US |
dc.description.sponsorship | Scientific Research Projects Coordination Unit of Recep Tayyip Erdogan University [373, 2016.53007.109.06.01]; Scientific and Technical Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [115F387]; Scientific Research Projects Coordination Unit of Recep Tayyip Erdogan University | en_US |
dc.description.sponsorship | This work was supported both by the Scientific Research Projects Coordination Unit of Recep Tayyip Erdogan University with the Project ID: 373 and Project Code: 2016.53007.109.06.01 and by the Scientific and Technical Research Council of Turkey (TUBITAK) with the Grant No. 115F387. Thanks to Dr. Raif Kandemir for his technical support to get the project grant from Scientific Research Projects Coordination Unit of Recep Tayyip Erdogan University. Finally, thanks to Dr. Celal YELGEL for his support on the DFT calculations. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Amer Inst Physics | en_US |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | Merit | en_US |
dc.subject | Figure | en_US |
dc.subject | Temperature | en_US |
dc.title | Thermoelectric properties of Mg2X (X = Si, Ge) based bulk and quantum well systems | en_US |
dc.type | article | en_US |
dc.contributor.department | RTEÜ, Mühendislik ve Mimarlık Fakültesi, Elektrik-Elektronik Mühendisliği Bölümü | en_US |
dc.contributor.institutionauthor | Yelgel, Övgü Ceyda | |
dc.identifier.doi | 10.1063/1.4974463 | |
dc.identifier.volume | 121 | en_US |
dc.identifier.issue | 3 | en_US |
dc.relation.journal | Journal of Applied Physics | en_US |
dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | en_US |