Enhancement of thermoelectric figure of merit of AgTlTe by tuning the carrier concentration

Abstract

The authors tried to enhance the thermoelectric figure of merit of AgTlTe with extremely low thermal conductivity by controlling the carrier concentration. Pd- or Cu-doped AgTlTe was prepared and characterized. Pd did not dissolve in AgTlTe, whereas Cu fully dissolved up to x=0.4 in Ag1−xCuxTlTe. The effect of Cu doping was investigated by measuring the thermoelectric properties of polycrystalline Ag1−xCuxTlTe (x=0−0.4) from room temperature to slightly below the melting temperature. Cu doping resulted in a net increase in the hole concentration of AgTlTe. Cu doping improved the power factor of AgTlTe while keeping the thermal conductivity extremely low, leading to an enhancement of the thermoelectric figure of merit.

Thermoelectric properties of gold telluride: AuTe2

“…In addition, it was also confirmed that the Ä lat of AuTe 2 was quite low with rather flat temperature dependence. The Ä lat values were ∼0.35 W m −1 K −2 , comparable to those of ternary silver tellurides with extremely low Ä lat [7,8].…”

“…In addition, complex tellurides containing Ag such as Ag 9 TlTe 5 [7], AgTlTe [8], * Corresponding author. Tel.…”

Thermoelectric properties of Cu3SbSe3 with intrinsically ultralow lattice thermal conductivity

“…30,31 There have been several studies demonstrating how the transport phenomenon can be tuned by optimization of carrier concentration for further enhancement of ZT in existing high performance TE materials. [44][45][46] Kurosaki et al 45 observed an enhancement in ZT of AgTlTe by tuning the carrier concentration via Cu doping. They observed a signicant increase in the power factor in AgTlTe without increasing the k by doping with 40% Cu, nally leading to a drastic increase in ZT from 0.3 to 0.6.…”

Thermoelectric properties of Ag1−xGaTe2 with chalcopyrite structure

“…Thermoelectric properties of Ag 12x GaTe 2 with chalcopyrite structure Aikebaier Yusufu, 1 Ken Kurosaki, 1,a) Atsuko Kosuga, 2 Tohru Sugahara, 1 Yuji Ohishi, 1 Hiroaki Muta, 1 and Shinsuke Yamanaka 1,3 1 Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan 2 Nanoscience and Nanotechnology Research Center, Research Organization for the 21st Century, Osaka Prefecture University, 1-2 Gakuen-cho, Naka-ku, Sakai-shi, Osaka 599-8570, Japan In the present study, we investigated the high-temperature thermoelectric (TE) properties of AgGaTe 2 with chalcopyrite structure. We tried to enhance the TE properties of AgGaTe 2 by reducing the Ag content.…”