Optimization of thermoelectric properties in n-type SnSe doped with BiCl3

Abstract

N-type SnSe compound has been synthesized through melting with spark plasma sintering. By doping BiCl3, the carrier concentration of SnSe is significantly increased, leading to a large enhancement of electrical conductivity. Meanwhile, the SnSe0.95-BiCl3 samples also exhibit higher Seebeck coefficient and lower lattice thermal conductivity, compared with polycrystalline SnSe. Consequently, a high power factor of ∼5 μW cm−1 K−2 and a ZT of 0.7 have been achieved at 793 K. The synergistic roles of BiCl3 doping in SnSe provide many opportunities in the optimization of n-type SnSe materials.

Texturing degree boosts thermoelectric performance of silver-doped polycrystalline SnSe

“…The highest ZT in Sn 0.99 Ag 0.02 Se is found to be over 0.9 at 793 K, which is higher than the reported values in polycrystalline SnSe materials. [21][22][23][24][25][26][27][28][29] However, this value is still smaller than that of the Ag-doped SnSe SC (1.2).…”

“…12,13 However, the doped polycrystalline samples still show ZT values that are less than 1.1, which is the highest reported value of undoped polycrystalline samples, although the carrier concentration has been optimized to 410 19 cm − 3 . [19][20][21][22][23][24][25][26][27][28][29][30] The deep understanding of electrical and thermal transport properties and exquisite control of the crystallite orientation in the samples are essential to achieve high thermoelectric performance in polycrystalline SnSe.…”

Achieving ZT=2.2 with Bi-doped n-type SnSe single crystals

“…In Na-doped p-type SnSe, Zhao et al 12. observed a ZT value ranging from 0.7 to 2.0 over the temperature range of 300–773 K. There are a few reports on n-type doped SnSe, which are polycrystalline with ZT values of below 1; ZT=1 in iodine-doped and 0.7 in BiCl 3 -doped SnSe1314.…”

Three‐Stage Inter‐Orthorhombic Evolution and High Thermoelectric Performance in Ag‐Doped Nanolaminar SnSe Polycrystals

“…[9] Nevertheless, the difficulties in large-scale synthesis of single crystals limit their practical applications, and extensive efforts have been devoted to the fabrication of high-performance polycrystalline counterparts. [14,16] For instance, a ZT of ≈0.8 at 773 K was obtained in I-doped SnSe polycrystals, whichThe ultrahigh thermoelectric performance of SnSe-based single crystals has attracted considerable interest in their polycrystalline counterparts. Due to an impressively low lattice thermal conductivity (≈0.20 W m −1 K −1 at 773 K) arising from the presence of coherent nanoprecipitates in the SnSe matrix, a high ZT of ≈1.1 at 773 K was achieved in the direction perpendicular to the pressing direction of SPS for ball-milled K-doped SnSe.…”