期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 37, 页码 13013-13023出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b05344
关键词
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资金
- National Key Research and Development Program of China [2017YFA0204700]
- Major State Basic Research Development Program [2013CB632500]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12010000]
- National Natural Science Foundation [21422310, 21773016, 61571423, 21333011]
- DOE Office of Science [DE-AC02-06CH11357]
Conjugated backbones play a fundamental role in determining the electronic properties of organic semiconductors. On the basis of two solution-processable dihydropyrrolo[3,4-c]pyrrole-1,4-diylidenebis(thieno[3,2-b]thiophene) derivatives with aromatic and quinoid structures, we have carried out a systematic study of the relationship between the conjugated-backbone structure and the thermoelectric properties. In particular, a combination of UV-vis-NIR spectra, photoemission spectroscopy, and doping optimization are utilized to probe the interplay between energy levels, chemical doping, and thermoelectric performance. We found that a moderate change in the conjugated backbone leads to varied doping mechanisms and contributes to dramatic changes in the thermoelectric performance. Notably, the chemically doped A-DCV-DPPTT, a small molecule with aromatic structure, exhibits an electrical conductivity of 5.3 S cm(-1) and a high power factor (PF373 (K)) up to 236 mu W m(-1) K-2, which is 50 times higher than that of Q-DCM-DPPTT with a quinoid structure. More importantly, the low thermal conductivity enables A-DCV-DPPTT to possess a figure of merit (ZT) of 0.23 +/- 0.03, which is the highest value reported to date for thermoelectric materials based on organic small molecules. These results demonstrate that the modulation of the conjugated backbone represents a powerful strategy for tuning the electronic structure and mobility of organic semiconductors toward a maximum thermoelectric performance.
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