热电效应
碲化铅
热电材料
凝聚态物理
材料科学
热导率
塞贝克系数
态密度
热传导
碲化物
工程物理
光电子学
功勋
兴奋剂
热力学
物理
复合材料
冶金
作者
Joseph P. Heremans,Vladimir Jovovic,Eric S. Toberer,Ali Saramat,Ken Kurosaki,Anek Charoenphakdee,Shinşuke Yamanaka,G. Jeffrey Snyder
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2008-07-25
卷期号:321 (5888): 554-557
被引量:3567
标识
DOI:10.1126/science.1159725
摘要
The efficiency of thermoelectric energy converters is limited by the material thermoelectric figure of merit ( zT ). The recent advances in zT based on nanostructures limiting the phonon heat conduction is nearing a fundamental limit: The thermal conductivity cannot be reduced below the amorphous limit. We explored enhancing the Seebeck coefficient through a distortion of the electronic density of states and report a successful implementation through the use of the thallium impurity levels in lead telluride (PbTe). Such band structure engineering results in a doubling of zT in p -type PbTe to above 1.5 at 773 kelvin. Use of this new physical principle in conjunction with nanostructuring to lower the thermal conductivity could further enhance zT and enable more widespread use of thermoelectric systems.
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