Giant transverse thermoelectric effect induced by topological transition in polycrystalline Dirac semimetal Mg 3 Bi 2
To achieve thermoelectric energy conversion, a large transverse thermoelectric effect in topological materials is crucial. However, a simple and effective way to manipulate the performance of transverse thermoelectric materials still remains elusive. Herein, we demonstrate a topological transition-i...
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Published in | Energy & environmental science Vol. 16; no. 4; pp. 1560 - 1568 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
12.04.2023
|
Online Access | Get full text |
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Summary: | To achieve thermoelectric energy conversion, a large transverse thermoelectric effect in topological materials is crucial. However, a simple and effective way to manipulate the performance of transverse thermoelectric materials still remains elusive. Herein, we demonstrate a topological transition-induced giant transverse thermoelectric effect in polycrystalline Mn-doped Mg
3+
δ
Bi
2
material, which has a competitively large transverse thermopower (617 μV K
−1
), power factor (20 393 μW m
−1
K
−2
), magnetoresistance (16 600%), and electronic mobility (35 280 cm
2
V
−1
s
−1
). The high performance is triggered by the modulation of the negative chemical pressure and disorder effects in the presence of Mn doping, which induces the transition from a topological insulator to a Dirac semimetal. The high-performance polycrystalline Mn-doped Mg
3+
δ
Bi
2
described in this work robustly boosts the transverse thermoelectric effect through topological phase transition, paving a new avenue for the material design of transverse thermoelectricity. |
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ISSN: | 1754-5692 1754-5706 |
DOI: | 10.1039/D2EE03924A |