Optical and thermoelectric properties of nano-particles based Bi2(Tei-xSex)3 thin films

被引：32

作者：

Adam, A. M. ^{[1
,2
]}

Lilov, E. ^{[1
]}

Petkov, P. ^{[1
]}

机构：

[1] Univ Chem Technol & Met, Dept Phys, Sofia, Bulgaria

[2] Sohag Univ, Dept Phys, Fac Sci, Sohag, Egypt

来源：

SUPERLATTICES AND MICROSTRUCTURES | 2017年 / 101卷

关键词：

Thermoelectric power; Nano-particles films; Bi2Te3; Electrical conductivity; Power factor; ANTISITE DEFECTS; BI2TE3; BI2SE3; DEVICES;

D O I：

10.1016/j.spmi.2016.09.034

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Nano-particles of Bi2Te3 and Bi-2(Tei-xSex)(3) films were deposited using vacuum thermal evaporation technique from previously prepared bulk alloys synthesized by melting method. Optical and thermoelectric properties were studied in the temperature range of 300-473K. The formation of none- and Se-doped Bi2Te3 nano-particles was verified by EDX and XRD analysis. TEM, SEM and AFM analysis showed the prepared films are polycrystalline in nature. The measurements of electrical conductivity and Seebeck coefficient, alongside with thermal conductivity calculations, resulted in the highest values of thermoelectric power at high temperature to be reported. The maximum value of power factor was calculated at 62.82917 mu WK(-2)cm(-1) for (Bi2Se0.3Te1.7) sample at 463 K. On the addition of Se to Bi2Te3 film, a significant decrease of the electronic thermal conductivity (K-el) from 2.181 x 10(-2) to 0.598 x 10(-2) (mu W/cm.K) could be achieved. Figure of merit (ZT) calculations showed a maximum value of 0.85 at room temperature, for Bi2Te3. Besides the increase of ZT value for all samples at higher temperature, surprisingly, a value of 2.75 for (Bi2Se1.2Te1.8) was obtained. We believe our results could open avenues for new applications. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：609 / 624

页数：16