Dan Zhang, Manzhe Zhao, Jiandong Liu, Hongli Wang, Ping He, Xingyuan San, Junyou Yang, Yubo Luo, Shufang Wang
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引用次数: 0
Abstract
Resonant level engineering is an effective strategy to increase the Seebeck coefficient of thermoelectric semiconductors for high performance. Herein, we report a significant enhancement of the thermoelectric performance of PbSnGeTe3 over a wide temperature region through the In doping induced resonant level. Due to the simultaneously strengthened effective mass by inducing resonant levels nearby the Fermi level and decreased carrier concentration, a considerably improved Seebeck coefficient is obtained in In-doped PbSnGeTe3 and thereby the greatly increased power factor. The decreased carrier concentrations resulting from In substitution can also suppress the electronic thermal conductivity for a decreased thermal conductivity. The enhanced power factor and reduced thermal conductivity finally contribute to an extraordinarily high average ZT of 0.93 between 300 and 773 K in PbSnGeTe3. These observations demonstrate the viability of resonant levels in advancing thermoelectric materials with intrinsically high carrier concentrations.
期刊介绍：
Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology.
In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics.
APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field.
Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.
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