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dc.contributor.authorZhao, Kunpeng
dc.contributor.authorQiu, Pengfei
dc.contributor.authorSong, Qingfeng
dc.contributor.authorBlichfeld, Anders Bank
dc.contributor.authorEikeland, Espen
dc.contributor.authorRen, Dudi
dc.contributor.authorGe, Binghui
dc.contributor.authorIversen, Bo B
dc.contributor.authorShi, Xun
dc.contributor.authorChen, Lidong
dc.date.accessioned2018-03-09T07:02:12Z
dc.date.available2018-03-09T07:02:12Z
dc.date.created2017-09-18T10:12:23Z
dc.date.issued2017
dc.identifier.citationMaterials today physics. 2017, 1 14-23.nb_NO
dc.identifier.issn2542-5293
dc.identifier.urihttp://hdl.handle.net/11250/2489624
dc.description.abstractLiquid-like thermoelectric materials have recently received heightened attentions due to their exceptional thermal and electrical transport properties. As a typical example, Cu2−ySe has good electrical transport properties while Cu2−yS has extremely low lattice thermal conductivity. Combining these stirring characters into one material is expected to result in excellent thermoelectric performance. In this study, we found that Cu2−ySe and Cu2−yS can form a solid solution in the composition range down to half Se and half S. XRD, SEM and TEM reveal that Cu2−ySe0.5S0.5 possesses a unique hierarchical microstructure composed of mesoscale polymorphs, nanoscale domains and modulations. Besides, the liquid-like copper ions at high temperature not only strongly scatter lattice phonons but also eliminate some of the transverse phonon vibrations. Combining with the extraordinarily low sound speeds, an overall ultralow thermal conductivity is achieved in Cu2−ySe0.5S0.5 with the values similar to that in Cu2S. Furthermore, the electrical transport performance of Cu2−ySe0.5S0.5 is significantly improved through tuning its native Cu vacancies. High electrical power factors similar to or even superior to Cu2−ySe are observed due to the high weighted mobility. All these favorable factors lead to much enhanced quality factor and thus remarkably high thermoelectric performance in Cu2−ySe0.5S0.5, which reaches a ZT of 2.3 at 1000 K, among the highest values in bulk materials.nb_NO
dc.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.titleUltrahigh thermoelectric performance in Cu2−ySe0.5S0.5 liquid-like materialsnb_NO
dc.typeJournal articlenb_NO
dc.description.versionsubmittedVersionnb_NO
dc.source.pagenumber14-23nb_NO
dc.source.volume1nb_NO
dc.source.journalMaterials today physicsnb_NO
dc.identifier.doi10.1016/j.mtphys.2017.04.003
dc.identifier.cristin1494640
dc.relation.projectNorges forskningsråd: 250403nb_NO
dc.description.localcodeThis is a submitted manuscript of an article published by Elsevier Ltd in Materials Today Physics, 7 June 2017.nb_NO
cristin.unitcode194,66,35,0
cristin.unitnameInstitutt for materialteknologi
cristin.ispublishedtrue
cristin.fulltextpreprint


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