Journal
ADVANCED ELECTRONIC MATERIALS
Volume 5, Issue 4, Pages -Publisher
WILEY
DOI: 10.1002/aelm.201800892
Keywords
2D materials; Boltzmann transport equation; coordination polymers; DFT; electron-phonon coupling
Funding
- Agency for Science, Technology and Research (A*STAR) of Singapore [1527200024]
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Recently, the 2D dt planar sr-conjugated transition metal complexes have gained extensive attention owing to their extra-high electrical conductivity. Meanwhile, low lattice thermal conductivities can be expected for their soft and microporous structures, suggesting very promising thermoelectric applications. Herein, based on first-principles calculations and molecular dynamics simulations, it is identified that monolayered 2D nickel bis(dithiolene) complex, (NiC4S4)(n), is indeed such a material that exhibits exceptionally high electron mobility, low lattice thermal conductivity, and thereby excellent thermoelectric performance. The calculated figure of merit at 300 K can reach up to 0.92 for a perfect nanosheet. At the same time, the mechanism behind is uncovered, that is, the weak electron-acoustic phonon coupling allowing high electron mobility, and its microporous structure decreasing the thermal transport. The surprisingly weak electron acoustic -phonon coupling arises from mixed bonding antibonding nature of conduction band. The finding opens a new opportunity for these 2D coordination complexes as potential thermoelectric materials.
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