期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 51, 页码 18732-18738出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b11662
关键词
-
资金
- National Natural Science Foundation of China [51571007, 51772012, 11404160, 51632005]
- Beijing Municipal Science & Technology Commission [Z171100002017002]
- Shenzhen Peacock Plan team [KQTD2016022619565991]
- 111 Project [B17002]
- National University of Singapore
High thermoelectric performance of n-type PbTe is urgently needed to match its p-type counterpart. Here, we show a peak ZT similar to 1.5 at 723 K and a record high average ZT > 1.0 at 300-873 K realized in n-type PbTe by synergistically suppressing lattice thermal conductivity and enhancing carrier mobility by introducing Cu2Te inclusions. Cu performs several outstanding roles: Cu atoms fill the Pb vacancies and improve carrier mobility, contributing to an unexpectedly high power factor of, similar to 37 mu W cm(-1) K-2 at 423 K; Cu atoms filling Pb vacancies and Cu interstitials both induce local disorder and, together with nano- and microscale Cu-rich precipitates and their related strain fields, lead to a very low lattice thermal conductivity of similar to 0.38 Wm(-1) K-1 in PbTe-5.5%Cu2Te, approaching the theoretical minimum value of 0.36 Wm(-1) K-1. This work provides an effective strategy to enhance thermoelectric performance by simultaneously improving electrical and thermal transport properties.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据