Temperature dependence of the Raman spectra of Bi₂Te₃ and Bi_0.5Sb_1.5Te₃ thermoelectric films

Abstract

The temperature dependence of the Raman spectra of Bi2Te3 and Bi0.5Sb1.5Te3 thermoelectric films was investigated. The temperature coefficients of the Eg(2) peak positions were determined as –0.0137 cm–1/°C and –0.0156 cm–1/°C, respectively. The thermal expansion of the crystal caused a linear shift of the Raman peak induced by the temperature change. Based on the linear relation, a reliable and noninvasive micro‐Raman scattering method was shown to measure the thermal conductivity of the thermoelectric films. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Electronic structures and thermoelectric properties of La or Ce-doped Bi2Te3 alloys from first principles calculations

“…where S is the Seebeck coefficient, T is the temperature, s is the electrical conductivity, κ l is the lattice thermal conductivity, and κ e is the thermal conductivity of electronic carriers [6,7]. In order to achieve a high ZT value, S and s need to be raised, and κ l and κ e should be decreased.…”

“…Thermoelectric materials have attracted intense interest due to wide applications in chip cooling, power generation, and infrared sensing [1][2][3][4][5][6][7][8]. The performance of thermoelectric materials can be evaluated by the dimensionless figure of merit, ZT, which is defined as…”

BiotecVisions 2015, June

“…The thermal conductivities of the DC‐ and pulse‐deposited nanowires are significantly lower than those of the corresponding bulk materials,16 as shown Figure 6 d, which is expected because of the increased phonon boundary scattering in nanowires 19. Compared with the thermal conductivity of the electrodeposited Bi 0.5 Sb 1.5 Te 3 films (2.1 W mK −1 ) reported by Li et al.,20 the thermal conductivity (≈0.3 W mK −1 ) of the electrodeposited Bi 0.5 Sb 1.5 Te 3 nanowires is much lower. Generally, the thermal conductivity has contributions from both, electrons and phonons.…”

A First-Principles Theoretical Study on the Thermoelectric Properties of the Compound Cu5AlSn2S8

“…[7][8][9][10][11] Generally, as ZT increases, the performance of TE materials also improves. Various types of TE materials have been investigated including Bi 2 Te 3 -based, [12][13][14][15] ZnSbbased, [16][17][18][19] CoSb 3 -based, [20][21][22] half-Heuslerbased, [23][24][25][26][27] PbTe-based, [28][29][30] Cu 2 Se-based, [31][32][33] oxide-based, [34][35][36][37] and organic TE materials.…”