Electrical transpoet properties of SiGe thermoelectric alloys doped with As, P, and As+P

Abstract

The Hall coefficient R H , Seebeck coefficient, and electrical resistivity have been measured on hot-pressed SiGe alloys (80 at.% Si) from 4 to 300 K. The alloys were doped with As, P, or As+P from 5XlO 18 to 1.75 X 10 20 cm-J • Only slight differences in transport properties with dopant type were observed. Studies of dopant solubilities were pursued, and the results suggest that the limiting electrically active As concentrations are below those of P. In the analysis of the transport data the standard treatment of ionized impurity scattering was found to be inadequate. The theory, when modified to include the energy dependence of the screening factor, gives an adequate description of our data. Hall factors were determined from RH data and dopant concentrations obtained from chemical analysis. Hall factors were also determined from analysis of the transport data and were about 20% smaller than those based on dopant concentrations deduced from chemical analysis.

Thermoelectric Properties of Sintered and Textured Nd-Substituted Ca3Co4O9 Ceramics

“…The recent discovery of oxide materials with large thermopower, S, has renewed interest in these materials. In particular the discovery of thermoelectric oxide materials with a potential to resist oxidation or decomposition at high temperatures, in contrast to conventional intermetallics such as SiGe, Bi 2 Te 3 , [1][2][3] renewed hopes for applications. Since the first reported thermoelectric oxide NaCo 2 O 4 , 4) various new oxide materials such as Ca 3 Co 4 O 9 and Bi/Sr/Co/O exhibiting both high performance and environmental stability at high temperatures have been intensively ''studied''.…”

Fabrication and thermoelectric properties of Ca3−xDyxCo4O9+δ system

“…The performance of a thermoelectric material is usually characterized by the figure of merit Z = S 2 /ρκ, where S, ρ and κ are thermopower, electrical resistivity and thermal conductivity, respectively. At present, the materials with the highest thermoelectric performance are intermetallic compounds, such as (Bi, Sb) 2 (Te, Se) 3 [1,2], filled skutterudites [3][4][5] and Si-Ge alloy [6,7], which have the values of ZT about 1. But their applications to power generation systems have been limited because they are easily decomposed or oxidized at high temperature in air.…”

Best Performing SiGe/Si Core‐Shell Nanoparticles Synthesized in One Step for High Capacity Anodes

“…In addition, Si 100‐ x Ge x solid solutions can be formed, which may open new perspectives for designing high performance anodes. Silicon−germanium alloys were initially studied mainly for thermoelectric applications or as semiconductors . Their use as active phase in Li‐ion batteries anodes was contemplated only recently.…”