Nanomorphology-driven two-stage hole mobility in blend films of regioregular and regiorandom polythiophenes

We report the nanomorphology-driven two-stage hole mobility in the blend films of regioregular and regiorandom poly(3-hexylthiophene) (P3HT) polymers of which regioregularity was 92.2% and 33.0%, respectively. The hole mobility of blend films was measured by employing a top-contact type organic fiel...

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Bibliographic Details
Published in:Nanoscale 2011-01, Vol.3 (10), p.4261-4269
Main Authors: Nam, Sungho, Lee, Seungsoo, Lee, Inhyuk, Shin, Minjung, Kim, Hwajeong, Kim, Youngkyoo
Format: Article
Language:English
Subjects:
Blends
Electrodes
Fullerenes - chemistry
Hole mobility
Microscopy, Atomic Force
Nanocomposites
Nanomaterials
Nanostructure
Nanostructures - chemistry
Order disorder
Silver
Silver - chemistry
Stereoisomerism
Thiophenes - chemistry
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Summary:We report the nanomorphology-driven two-stage hole mobility in the blend films of regioregular and regiorandom poly(3-hexylthiophene) (P3HT) polymers of which regioregularity was 92.2% and 33.0%, respectively. The hole mobility of blend films was measured by employing a top-contact type organic field-effect transistor which has an aromatic polyimide gate insulating layer and silver source/drain electrodes. Results showed that the hole mobility of blend films was suddenly reduced as large as two orders of magnitude as the bulk regioregularity of blend films decreased from 89.8% to 86.3%, even though the hole mobility change was far less than one order of magnitude after and before this boundary condition. The discontinuous two-stage hole mobility trend has been attributed to the destruction of P3HT chain ordering/alignment in the blend films at the boundary blend composition, as evidenced from the huge changes in optical absorption coefficient, surface nanomorphology, and in-plane/out-of-plane nanostructures in the blend films.
ISSN:2040-3364
2040-3372
DOI:10.1039/c1nr10670h