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Title: Air-stable solution-processed n-channel organic thin film transistors with polymer-enhanced morphology

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4919677· OSTI ID:22399019
; ; ;  [1];  [2]
  1. Department of Electrical and Computer Engineering, Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487 (United States)
  2. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

N,N′-1H,1H-perfluorobutyl dicyanoperylenecarboxydiimide (PDIF-CN{sub 2}) is an n-type semiconductor exhibiting high electron mobility and excellent air stability. However, the reported electron mobility based on spin-coated PDIF-CN{sub 2} film is much lower than the value of PDIF-CN{sub 2} single crystals made from vapor phase deposition, indicating significant room for mobility enhancement. In this study, various insulating polymers, including poly(vinyl alcohol), poly(methyl methacrylate) (PMMA), and poly(alpha-methylstyrene) (PαMS), are pre-coated on silicon substrate aiming to enhance the morphology of the PDIF-CN{sub 2} thin film, thereby improving the charge transport and air stability. Atomic force microscopy images reveal that with the pre-deposition of PαMS or PMMA polymers, the morphology of the PDIF-CN{sub 2} polycrystalline films is optimized in semiconducting crystal connectivity, domain size, and surface roughness, which leads to significant improvement of organic thin-film transistor (OTFT) performance. Particularly, an electron mobility of up to 0.55 cm{sup 2}/V s has been achieved from OTFTs based on the PDIF-CN{sub 2} film with the pre-deposition of PαMS polymer.

OSTI ID:
22399019
Journal Information:
Applied Physics Letters, Vol. 106, Issue 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
Country of Publication:
United States
Language:
English

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Long-range crystal alignment with polymer additive for organic thin film transistors journal June 2019
Reversing and non-reversing effects of PEEK-HA composites on tuning cooling rate during crystallization journal November 2019
Nanoscale alignment of semiconductor crystals for high-fidelity organic electronics applications journal May 2019
Polymer additive controlled morphology for high performance organic thin film transistors journal January 2019
A N–H functionalized perylene diimide with strong red-light absorption for green solvent processed organic electronics journal January 2020
Solution-grown small-molecule organic semiconductor with enhanced crystal alignment and areal coverage for organic thin film transistors journal July 2015
Nanoparticles for organic electronics applications journal January 2020
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