Enhanced thermoelectric properties of (Pb1−xYbxTe)0.15(GeTe)0.85 composites due to phase separation and Yb doping

Thermoelectric Enhancement of Different Kinds of Metal Chalcogenides

“…As a result, GeTe always exhibits p‐ type conductivity with a high carrier concentration (10 20 cm −3 to 10 21 cm −3 ), which leads to high electrical conductivity and thermal conductivity. Element doping is an effective way to improve the thermoelectric properties of GeTe by reducing its hole concentration and/or introducing a secondary phase into the matrix to reduce its thermal conductivity, e.g., Mn, Yb doped GeTe . At ambient temperature, the thermodynamically stable pseudo‐binary compounds of the homologous series Ge n Sb 2 Te n+3 consist of tetradymite‐type Sb 2 Te 3 slabs that are formally enlarged by n layers of additional GeTe.…”

Highly efficient (In2Te3)x(GeTe)3−3x thermoelectric materials: a substitute for TAGS

“…15 Various structure modifications of GeTe have been investigated very recently, several of which achieved impressive thermoelectric performance. [16][17][18][19] In our work, we present the TE properties of another simple GeTe-based solid solution, namely (In 2 Te 3 ) x (GeTe) 3À3x . According to the GeTe-In 2 Te 3 pseudo binary phase diagram, 20 the single phase solid solutions exist over a large In 2 Te 3 concentration range, especially at high temperatures.…”

Controlling phase separation in thermoelectric Pb1−xGexTe to minimize thermal conductivity

“…We note that in this work we have made no attempt to optimize the electronic contribution to the thermoelectric performance by chemical doping or further alloying, which has previously proven successful for Pb 1Àx Ge x Te with for example Bi 2 Te 3 , 1,38 Se 39 and Yb. 40 Another approach was recently followed by Bu et al, 41 who obtained true solid solutions of Pb 1Àx Ge x Te (x ¼ 0.4-0.9) by quenching from the single-phase region of the phase diagram at 873 K into ice water, likely at a faster rate than our samples. A single rhombohedral phase was then obtained, avoiding phase decomposition as long as the temperature was kept below 350 K; this allowed the rhombohedral distortion to be tuned by varying the value of x.…”