Alternatingly Stacked Low- and High-Resistance PtSe2/PtSe2 Homostructures Boost Thermoelectric Power Factors

2D transition-metal dichalcogenide (TMDC) materials are promising candidates with excellent thermoelectric (TE) properties owing to their low dimensionality in electronic and phonon transport. However, the considerable coupling of the Seebeck coefficient and electrical conductivity in such TE materials eventually results in the limit of the TE power factor increase, which severely hinders potential TE device applications. Herein, an alternative approach is demonstrated for breaking the strong coupling between the Seebeck coefficient and electrical conductivity in single TE materials by adopting a novel stacked PtSe2/PtSe2 homostructure. By alternately piling low-resistance (LR) PtSe2 (3 nm) onto high-resistance (HR) PtSe2 (2 nm) as one unit, the Seebeck coefficient and electrical conductivity of such stacked homostructures can be greatly enhanced with slightly improved electrical conductivity, ultimately resulting in a TE power factor in three-unit-stacked homostructures that is approximate to 1,648% higher than that of a single PtSe2 (15 nm) layer with the same thickness. This enhancement is attributed to an independent increase in the Seebeck coefficient, which depends on the interface among the LR and HR PtSe2 layers. The findings pave the way for a method that, unlike power factor optimization in conventional thermoelectric materials, can only utilize the Seebeck coefficient and electrical conductivity of each layer in a stacked homostructure.

Kang, Min-SungChung Ang Univ, Ctr Berry Curvature Based New Phenomena, Dept Phys, Seoul 06974, South Korea. (author)
Choi, Jae WonChung Ang Univ, Ctr Berry Curvature Based New Phenomena, Dept Phys, Seoul 06974, South Korea. (author)
Kim, Si-HooChung Ang Univ, Ctr Berry Curvature Based New Phenomena, Dept Phys, Seoul 06974, South Korea. (author)
Park, No-WonChung Ang Univ, Ctr Berry Curvature Based New Phenomena, Dept Phys, Seoul 06974, South Korea. (author)
Kim, Gil-SungChung Ang Univ, Ctr Berry Curvature Based New Phenomena, Dept Phys, Seoul 06974, South Korea. (author)
Kim, Yun-HoChung Ang Univ, Ctr Berry Curvature Based New Phenomena, Dept Phys, Seoul 06974, South Korea. (author)
Lee, Sang-KwonChung Ang Univ, Ctr Berry Curvature Based New Phenomena, Dept Phys, Seoul 06974, South Korea. (author)
Uppsala universitetFasta tillståndets elektronik (creator_code:org_t)

By the author/editor: Lee, Won-Yong; Kang, Min-Sung; Choi, Jae Won; Kim, Si-Hoo; Park, No-Won; Kim, Gil-Sung; show more...; Kim, Yun-Ho; Lee, Sang-Kwon; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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