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Air-stable π-conjugated amorphous copolymer field-effect transistors with high mobility of 0.3 cm2/Vs

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6 Author(s)
Georgakopoulos, S. ; Advanced Technology Institute, Electronic Engineering, University of Surrey, Guildford GU2 7XH, United Kingdom ; Sparrowe, D. ; Gu, Y. ; Nielsen, M.M.
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We have fabricated organic bottom-contact top-gate field-effect transistors with an indenofluorene-phenanthrene co-polymer semiconductor, exhibiting ON/OFF ratio of 107 and uncommonly high mobility for an amorphous conjugated polymer of up to 0.3 cm2/Vs. Lack of crystallinity in this material is indicated by atomic force microscopy, grazing incidence wide angle X-ray scattering, and differential scanning calorimetry data. Nevertheless, fitting transistor data to the Gaussian disorder model gives low energetic disorder of σ = 48 meV and high prefactor mobility μ0 = 0.67 cm2/Vs. The measured transistor mobility is also exceptionally stable in ambient conditions, decreasing only by approximately 15% over two months.

Published in:

Applied Physics Letters  (Volume:101 ,  Issue: 21 )

Date of Publication:

Nov 2012

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