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Issue 10, 2011
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Nanomorphology-driven two-stage hole mobility in blend films of regioregular and regiorandom polythiophenes

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Abstract

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.

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

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Supplementary files

Article information


Submitted
24 Jun 2011
Accepted
29 Jul 2011
First published
02 Sep 2011

Nanoscale, 2011,3, 4261-4269
Article type
Paper

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

S. Nam, S. Lee, I. Lee, M. Shin, H. Kim and Y. Kim, Nanoscale, 2011, 3, 4261 DOI: 10.1039/C1NR10670H

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