Thermal and Thermoelectric Transport in Highly Resistive Single Sb2Se3 Nanowires and Nanowire Bundles

Abstract

In this study, we measured the thermal conductivity and Seebeck coefficient of single Sb2Se3 nanowires and nanowire bundles with a high resistivity (σ ~ 4.37 × 10−4 S/m). Microdevices consisting of two adjacent suspended silicon nitride membranes were fabricated to measure the thermal transport properties of the nanowires in vacuum. Single Sb2Se3 nanowires with different diameters and nanowire bundles were carefully placed on the device to bridge the two membranes. The relationship of temperature difference on each heating/sensing suspension membranes with joule heating was accurately determined. A single Sb2Se3 nanowire with a diameter of ~ 680 nm was found to have a thermal conductivity (kNW) of 0.037 ± 0.002 W/m·K. The thermal conductivity of the nanowires is more than an order of magnitude lower than that of bulk materials (k ~ 0.36–1.9 W/m·K) and highly conductive (σ ~ 3 × 104 S/m) Sb2Se3 single nanowires (k ~ 1 W/m·K). The measured Seebeck coefficient with a positive value of ~ 661 μV/K is comparable to that of highly conductive Sb2Se3 single nanowires (~ 750 μV/K). The thermal transport between wires with different diameters and nanowire bundles was compared and discussed.

Benchmark characterization of the thermoelectric properties of individual single-crystalline CdS nanowires by a H-type sensor

“…5. 6,7,[15][16][17]27,28 Our experimental result is in good agreement with the data measured using the optical Raman method (red line in Fig. 5).…”

Enhanced electrical conductivity and photoconductive properties of Sn-doped Sb2Se3 crystals

“…Antimony selenide (Sb 2 Se 3 ) is an important V-VI binary semiconductor with excellent photovoltaic, photoconducting, photocatalytic and thermoelectric properties. [1][2][3][4][5][6] It has a high absorption coefficient higher than 10 5 cm À1 in the visible region and an optimum bandgap width of around 1.1 eV for single junction solar cells. In addition, it is stable and nontoxic and composed of earth abundant elements.…”

“…These properties make it a promising candidate for various important applications in diverse areas such as solar energy conversion, photodetector technology, thermoelectric power generation, and opto-electronics in the near-infrared region. 5,[7][8][9][10][11] Despite the important research efforts, the progress in application development is still limited. One major issue with Sb 2 Se 3 is its intrinsic low electrical conductivity (10 À6 O À1 m À1 , in the bulk state), which results in low thermoelectric power factor, low spectral response and low external quantum efficiency.…”

Fast, green microwave-assisted synthesis of single crystalline Sb2Se3 nanowires towards promising lithium storage

“…Schematic illustration of synthesis procedure and formation mechanism of Sb 2 Se 3 nanowire via solvent-mediated microwave irradiation. pletely reduce SeO 3 2 − into Se colloid neither contribute to form (Sb x Se y ) n high-active colloids.…”

“…Main-group V −VI metal chalcogenides semiconductors are of great technological importance because of their typical narrow band gap and size-dependent properties [1] . Among these compounds, antimony selenide (Sb 2 Se 3 ) is one kind of representative direct band-gap semiconductors ( E g ≈ 1.11 eV) and has held promise in the applications of optoelectronic [2] , thermoelectrics [3] , photovoltaics [4,5] and electrochemical energy storage [6][7][8][9] . Various novel Sb 2 Se 3 nanostructures exhibit different physical and chemical properties compared with their bulk counterparts.…”