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The efficiency of a thermoelectric device for electricity generation is given by , defined as =.. The maximum efficiency of a thermoelectric device is typically described in terms of its device figure of merit where the maximum device efficiency is approximately given by [7] = + ¯ + ¯ +, where is the fixed temperature at the hot junction, is the fixed temperature at the surface being cooled ...
The performance of thermoelectric materials can be evaluated by the figure of merit, = /, in which is the Seebeck coefficient, is the electrical conductivity and is the thermal conductivity. In order to improve the thermoelectric performance of materials, the power factor ( S 2 σ {\displaystyle S^{2}\sigma } ) needs to be maximized and the ...
For example, as observed before in La 2 Co 2 O 3 Se 2, Sr 2 F 2 Mn 2 Se 2 O exhibits a frustrated magnetic correlation in the structure resulting in an antiferromagnetic lattice. [ 11 ] In 2010, p-type polycrystalline BiCuSeO oxyselenides were reported as possible thermoelectric materials. [ 12 ]
Only a few known materials to date are identified as thermoelectric materials. Most thermoelectric materials today have a zT, the figure of merit, value of around 1, such as in bismuth telluride (Bi 2 Te 3) at room temperature and lead telluride (PbTe) at 500–700 K. However, in order to be competitive with other power generation systems, TEG ...
The BiTe-based TE material can achieve a conversion efficiency of 8%, an average zT value of 1.05 for p-type and 0.84 for n-type bismuth telluride alloys. [81] Lanthanum telluride can be potentially used in deep space as a thermoelectric generator due to the huge temperature difference in space.
The thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa via a thermocouple. [1] A thermoelectric device creates a voltage when there is a different temperature on each side. Conversely, when a voltage is applied to it, heat is transferred from one side to the other, creating a temperature ...
The use of materials with a high Seebeck coefficient [3] is one of many important factors for the efficient behaviour of thermoelectric generators and thermoelectric coolers. More information about high-performance thermoelectric materials can be found in the Thermoelectric materials article.
Bismuth selenide is a semiconductor and a thermoelectric material. [4] While stoichiometric bismuth selenide should be a semiconductor with a gap of 0.3 eV, naturally occurring selenium vacancies act as electron donors, so Bi 2 Se 3 is intrinsically n-type. [5] [6] [7] Bismuth selenide has a topologically insulating ground-state. [8]