کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990691 | 1516130 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermoelectric properties of TcX2(X=S, Se, Te)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have studied the thermoelectric properties of TcX2(Xâ¯=â¯S, Se, Te) by combined first-principles density functional theory with Boltzmann transport approach. The results show that TcS2 and TcSe2 have high Seebeck coefficients within a reasonable doping level, and their Seebeck coefficients are all at the magnitude of 10â4V/K, however, the Seebeck coefficients of TcTe2 are always smaller than 2Ã10â4 V/K. The peak of Seebeck coefficient is uplifted as doping level decreases. The power factors have a promising value and can be greatly enhanced by p-type doping along all direction of TcS2, along x-direction of TcSe2, and along x- and y-direction of TcTe2, while by n-type doping for other directions. It finds that when the doping level is 1â¯Ãâ¯1019cmâ3 the peak of power factor appears along z-direction of TcS2 and x-direction of TcSe2, and when the doping level reaches 1â¯Ãâ¯1020â¯cmâ3 the power factors along x- and y-direction of TcS2 and x-direction of TcSe2 reach its peak, meanwhile, the peaks of power factor along the x- and y-direction of TcTe2 occur when the doping level is 1â¯Ãâ¯1021cmâ3. These results mean that we can optimize the Seebeck coefficients and power factor by proper doping, and TcX2(Xâ¯=â¯S, Se, Te) is candidate for thermoelectric application.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 764, 5 October 2018, Pages 505-511
Journal: Journal of Alloys and Compounds - Volume 764, 5 October 2018, Pages 505-511
نویسندگان
X. Jiang, L. Zhu, K.L. Yao,