Remarkable enhancement of charge carrier mobility of conjugated polymer field-effect transistors upon incorporating an ionic additive

Luo, Hewei; Yu, Chenmin; Liu, Zitong; Zhang, Guanxin; Geng, Hua; Yi, Yuanping; Broch, Katharina; Hu, Yuanyuan; Sadhanala, Aditya; Jiang, Lang; Qi, Penglin; Cai, Zhengxu; Sirringhaus, Henning; Zhang, Deqing

doi:10.1126/sciadv.1600076

Remarkable enhancement of charge carrier mobility of conjugated polymer field-effect transistors upon incorporating an ionic additive

Journal Article · Fri May 13 00:00:00 EDT 2016 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1600076· OSTI ID:1257471

Luo, Hewei ^[1]; Yu, Chenmin ^[1]; ^[1]; Zhang, Guanxin ^[1]; Geng, Hua ^[1]; ^[1]; Broch, Katharina ^[2]; Hu, Yuanyuan ^[2]; Sadhanala, Aditya ^[2]; Jiang, Lang ^[2]; Qi, Penglin ^[1]; Cai, Zhengxu ^[1]; Sirringhaus, Henning ^[2]; Zhang, Deqing ^[1]

Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of Cambridge (United Kingdom)

Organic semiconductors with high charge carrier mobilities are crucial for flexible electronic applications. Apart from designing new conjugated frameworks, different strategies have been explored to increase charge carrier mobilities. We report a new and simple approach to enhancing the charge carrier mobility of DPP-thieno[3,2-b]thiophene–conjugated polymer by incorporating an ionic additive, tetramethylammonium iodide, without extra treatments into the polymer. The resulting thin films exhibit a very high hole mobility, which is higher by a factor of 24 than that of thin films without the ionic additive under the same conditions. On the basis of spectroscopic grazing incidence wide-angle x-ray scattering and atomic force microscopy studies as well as theoretical calculations, the remarkable enhancement of charge mobility upon addition of tetramethylammonium iodide is attributed primarily to an inhibition of the torsion of the alkyl side chains by the presence of the ionic species, facilitating a more ordered lamellar packing of the alkyl side chains and interchain π-π interactions.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Natural Science Foundation of China; Strategic Priority Research Program of the Chinese Academy of Sciences

OSTI ID:: 1257471

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 5 Vol. 2; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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tetramethylammonium iodide

Remarkable enhancement of charge carrier mobility of conjugated polymer field-effect transistors upon incorporating an ionic additive

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