期刊
CERAMICS INTERNATIONAL
卷 46, 期 6, 页码 7253-7258出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.11.219
关键词
Pulsed laser deposition; Bi2Te2.7Se0.3; Temperature-dependent Raman spectroscopy; Thermal conductivity; Thermoelectric materials
资金
- Deanship of Scientific Research, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran, Saudi Arabia [RG 1405-1]
- King Abdullah City for Atomic and Renewable Energy (K.A.CARE) [KACARE182-RFP-02, KACARE182-GSGP-05]
Thermoelectric (TE) materials have increasingly entranced the attention of researchers globally, with a view to providing alternative routes to clean energy. This work reports the first thermal conductivity measurement on pulsed laser deposited Bi2Se2.7Te0.3 (BTS) thin films by a non-contact and optical-based method. Structural characterization revealed well-crystalline films whereas the scanning electron microscope images show abundant grains typical of the BTS nanostructures. A highly stoichiometric composition was observed under energy dispersive spectroscopy. The film's first-order temperature coefficient was estimated by varying the substrate temperature using advanced Raman spectrometer equipped with an inbuilt Linkam stage. The linear dependence of the E-2(g) phonon mode on temperature and excitation laser power was harnessed to estimate the value of the suspended film's room temperature thermal conductivity. The first-order temperature coefficient was measured to be 0.0359 cm(-1) K-1. The low thermal conductivity measured at room temperature (kappa similar to 1.12 Wm(-1)K(-1)) is comparable to previously reported values obtained using different conventional techniques. This work proved the potential of Raman spectroscopy to estimate the thermal conductivity as an excellent alternative tool to the existing expensive and laborious techniques. In addition, this work demonstrated that BTS is an excellent material for thermoelectric energy harvesting.
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