--- res: bibo_abstract: - High carrier mobility is critical to improving thermoelectric performance over a broad temperature range. However, traditional doping inevitably deteriorates carrier mobility. Herein, we develop a strategy for fine tuning of defects to improve carrier mobility. To begin, n-type PbTe is created by compensating for the intrinsic Pb vacancy in bare PbTe. Excess Pb2+ reduces vacancy scattering, resulting in a high carrier mobility of ∼3400 cm2 V–1 s–1. Then, excess Ag is introduced to compensate for the remaining intrinsic Pb vacancies. We find that excess Ag exhibits a dynamic doping process with increasing temperatures, increasing both the carrier concentration and carrier mobility throughout a wide temperature range; specifically, an ultrahigh carrier mobility ∼7300 cm2 V–1 s–1 is obtained for Pb1.01Te + 0.002Ag at 300 K. Moreover, the dynamic doping-induced high carrier concentration suppresses the bipolar thermal conductivity at high temperatures. The final step is using iodine to optimize the carrier concentration to ∼1019 cm–3. Ultimately, a maximum ZT value of ∼1.5 and a large average ZTave value of ∼1.0 at 300–773 K are obtained for Pb1.01Te0.998I0.002 + 0.002Ag. These findings demonstrate that fine tuning of defects with <0.5% impurities can remarkably enhance carrier mobility and improve thermoelectric performance.@eng bibo_authorlist: - foaf_Person: foaf_givenName: Siqi foaf_name: Wang, Siqi foaf_surname: Wang - foaf_Person: foaf_givenName: Cheng foaf_name: Chang, Cheng foaf_surname: Chang foaf_workInfoHomepage: http://www.librecat.org/personId=9E331C2E-9F27-11E9-AE48-5033E6697425 orcid: 0000-0002-9515-4277 - foaf_Person: foaf_givenName: Shulin foaf_name: Bai, Shulin foaf_surname: Bai - foaf_Person: foaf_givenName: Bingchao foaf_name: Qin, Bingchao foaf_surname: Qin - foaf_Person: foaf_givenName: Yingcai foaf_name: Zhu, Yingcai foaf_surname: Zhu - foaf_Person: foaf_givenName: Shaoping foaf_name: Zhan, Shaoping foaf_surname: Zhan - foaf_Person: foaf_givenName: Junqing foaf_name: Zheng, Junqing foaf_surname: Zheng - foaf_Person: foaf_givenName: Shuwei foaf_name: Tang, Shuwei foaf_surname: Tang - foaf_Person: foaf_givenName: Li Dong foaf_name: Zhao, Li Dong foaf_surname: Zhao bibo_doi: 10.1021/acs.chemmater.2c03542 bibo_issue: '2' bibo_volume: 35 dct_date: 2023^xs_gYear dct_identifier: - UT:000914749700001 dct_isPartOf: - http://id.crossref.org/issn/0897-4756 - http://id.crossref.org/issn/1520-5002 dct_language: eng dct_publisher: American Chemical Society@ dct_title: Fine tuning of defects enables high carrier mobility and enhanced thermoelectric performance of n-type PbTe@ ...