کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8160527 | 1525110 | 2018 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Contrastive thermoelectric properties of strained SnSe crystals from the first-principles calculations
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
SnSe is a promising thermoelectric material with a record high dimensionless figure of merit ZT at high temperature â¼923â¯K. However, the ZT values for low-Temperature Pnma phase SnSe are just 0.1-0.9. Here, we use First-principle combine with Boltzmann transport theory methods to study the effect of tensile and compressible strain on the thermoelectric transport properties. The power factor of SnSe with â4% strain have a large boost along b and c directions of 7.7 and 3.9â¯Î¼Wâ¯cmâ1â¯Kâ2, respectively, which are 2.5 and 2 times as large as those pristine SnSe. The charge density distributions reveal that the overlap of wave function has significant change due to the changed bond lengths and bond angles under different strain, which lead to the change of band gap and band dispersion. Our work provides a new effective strategy to enhance the thermoelectric properties of materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 539, 15 June 2018, Pages 8-13
Journal: Physica B: Condensed Matter - Volume 539, 15 June 2018, Pages 8-13
نویسندگان
Yu Tang, Feng Cheng, Decong Li, Shuping Deng, Zhong Chen, Luqi Sun, Wenting Liu, Lanxian Shen, Shukang Deng,