Tuo Chen, Qian Xiang, Haoran Ge, Ziwei Li, Fan Yan, Jiahong Cheng, Min Hong, Yubo Luo, Junyou Yang, Yong Liu, Wei Liu, Xinfeng Tang
{"title":"Achieving high carrier mobility and thermoelectric performance in nearly twin-free rhombohedral GeTe (00l) films","authors":"Tuo Chen, Qian Xiang, Haoran Ge, Ziwei Li, Fan Yan, Jiahong Cheng, Min Hong, Yubo Luo, Junyou Yang, Yong Liu, Wei Liu, Xinfeng Tang","doi":"10.1016/j.mtener.2024.101550","DOIUrl":null,"url":null,"abstract":"GeTe-based thermoelectric (TE) films have garnered significant attentions due to their promising TE performance near room temperature. However, it is challenging to further optimizing the TE performance due to the inferior carrier mobility () and the excessively high hole density (). Herein, we developed a novel method based on molecular beam epitaxy (MBE) technique to successfully fabricate nearly twin-free GeTe (00) films incorporating BiTe buffer layers to alleviate epitaxial strain. Consequently, was significantly enhanced. Additionally, through comprehensively investigating the processing conditions, we found that substrate temperature and Te/GeTe flux ratio can shape intrinsic atomic defects and further decrease . With the optimal synthesis and processing conditions, the GeTe film achieves optimized of 3.44×10 cm and a high of 73.31 cmVs, which lead to the highest room-temperature power factor of 2.67 mWmK, outperforming the values of other GeTe films. This work provides important guidance on fabricating twin-free GeTe films and on further improving their TE performance.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":"99 1","pages":""},"PeriodicalIF":9.0000,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Today Energy","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.mtener.2024.101550","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
GeTe-based thermoelectric (TE) films have garnered significant attentions due to their promising TE performance near room temperature. However, it is challenging to further optimizing the TE performance due to the inferior carrier mobility () and the excessively high hole density (). Herein, we developed a novel method based on molecular beam epitaxy (MBE) technique to successfully fabricate nearly twin-free GeTe (00) films incorporating BiTe buffer layers to alleviate epitaxial strain. Consequently, was significantly enhanced. Additionally, through comprehensively investigating the processing conditions, we found that substrate temperature and Te/GeTe flux ratio can shape intrinsic atomic defects and further decrease . With the optimal synthesis and processing conditions, the GeTe film achieves optimized of 3.44×10 cm and a high of 73.31 cmVs, which lead to the highest room-temperature power factor of 2.67 mWmK, outperforming the values of other GeTe films. This work provides important guidance on fabricating twin-free GeTe films and on further improving their TE performance.
期刊介绍:
Materials Today Energy is a multi-disciplinary, rapid-publication journal focused on all aspects of materials for energy.
Materials Today Energy provides a forum for the discussion of high quality research that is helping define the inclusive, growing field of energy materials.
Part of the Materials Today family, Materials Today Energy offers authors rigorous peer review, rapid decisions, and high visibility. The editors welcome comprehensive articles, short communications and reviews on both theoretical and experimental work in relation to energy harvesting, conversion, storage and distribution, on topics including but not limited to:
-Solar energy conversion
-Hydrogen generation
-Photocatalysis
-Thermoelectric materials and devices
-Materials for nuclear energy applications
-Materials for Energy Storage
-Environment protection
-Sustainable and green materials