کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11020019 1717616 2019 44 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhancing thermoelectric performance of SnTe via stepwisely optimizing electrical and thermal transport properties
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Enhancing thermoelectric performance of SnTe via stepwisely optimizing electrical and thermal transport properties
چکیده انگلیسی
In this work, we report that the high performance of SnTe could be realized by enhancing electrical transport properties (power factor) and reducing thermal conductivity through stepwisely introducing elements of Sb, In and Se. We found that Sb and In co-doping can enhance Seebeck coefficients in the broad temperature range via optimizing carrier density and introducing resonant state, respectively. Moreover, nanostructures could be formed when the Sb content beyond the solubility limit in SnTe matrix, which coupled with point defects from In and Se alloying result in a very low (lattice) thermal conductivity through the enhanced phonon scattering from defects and grain boundaries. A peak ZT ∼1.0 at 923 K can be achieved with the enhanced power factor and reduced thermal conductivity. Accordingly, the average ZT value increases from ∼0.20 for undoped SnTe to ∼ 0.60 for multiple-doped SnTe (Sn0.823Sb0.17In0.007Te0.98Se0.02) over 300-923 K, generating a high calculated conversion efficiency ∼ 11%. Present results indicate the high performance of SnTe can be obtained through stepwisely optimizing strategy in both electrical and thermal transport properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 773, 30 January 2019, Pages 571-584
نویسندگان
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