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N-type organic thermoelectrics: demonstration of ZT > 0.3.

Abstract：

:The 'phonon-glass electron-crystal' concept has triggered most of the progress that has been achieved in inorganic thermoelectrics in the past two decades. Organic thermoelectric materials, unlike their inorganic counterparts, exhibit molecular diversity, flexible mechanical properties and easy fabrication, and are mostly 'phonon glasses'. However, the thermoelectric performances of these organic materials are largely limited by low molecular order and they are therefore far from being 'electron crystals'. Here, we report a molecularly n-doped fullerene derivative with meticulous design of the side chain that approaches an organic 'PGEC' thermoelectric material. This thermoelectric material exhibits an excellent electrical conductivity of >10 S cm-1 and an ultralow thermal conductivity of <0.1 Wm-1K-1, leading to the best figure of merit ZT = 0.34 (at 120 °C) among all reported single-host n-type organic thermoelectric materials. The key factor to achieving the record performance is to use 'arm-shaped' double-triethylene-glycol-type side chains, which not only offer excellent doping efficiency (~60%) but also induce a disorder-to-order transition upon thermal annealing. This study illustrates the vast potential of organic semiconductors as thermoelectric materials.

journal_name

Nat Commun

journal_title

Nature communications

authors

Liu J,van der Zee B,Alessandri R,Sami S,Dong J,Nugraha MI,Barker AJ,Rousseva S,Qiu L,Qiu X,Klasen N,Chiechi RC,Baran D,Caironi M,Anthopoulos TD,Portale G,Havenith RWA,Marrink SJ,Hummelen JC,Koster LJA

doi

10.1038/s41467-020-19537-8

subject

Has Abstract

pub_date

2020-11-10 00:00:00

pages

5694

issue

1

issn

2041-1723

pii

10.1038/s41467-020-19537-8

journal_volume

11

pub_type

杂志文章

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