Loading…
Giant thermoelectric power factor in ultrathin FeSe superconductor
The thermoelectric effect is attracting a renewed interest as a concept for energy harvesting technologies. Nanomaterials have been considered a key to realize efficient thermoelectric conversions owing to the low dimensional charge and phonon transports. In this regard, recently emerging two-dimens...
Saved in:
Published in: | Nature communications 2019-02, Vol.10 (1), p.825-825, Article 825 |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | The thermoelectric effect is attracting a renewed interest as a concept for energy harvesting technologies. Nanomaterials have been considered a key to realize efficient thermoelectric conversions owing to the low dimensional charge and phonon transports. In this regard, recently emerging two-dimensional materials could be promising candidates with novel thermoelectric functionalities. Here we report that FeSe ultrathin films, a high-
T
c
superconductor (
T
c
; superconducting transition temperature), exhibit superior thermoelectric responses. With decreasing thickness
d
, the electrical conductivity increases accompanying the emergence of high-
T
c
superconductivity; unexpectedly, the Seebeck coefficient
α
shows a concomitant increase as a result of the appearance of two-dimensional natures. When
d
is reduced down to ~1 nm, the thermoelectric power factor at 50 K and room temperature reach unprecedented values as high as 13,000 and 260 μW cm
−1
K
−2
, respectively. The large thermoelectric effect in high
T
c
superconductors indicates the high potential of two-dimensional layered materials towards multi-functionalization.
In an effort to optimize the performance of two-dimensional materials for thermoelectric generation, compounds with advantageous intrinsic properties must be identified. Here, the authors report large thermoelectric effect in ultrathin FeSe thin films with high T
c
superconductivity. |
---|---|
ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/s41467-019-08784-z |