Significant Performance Improvement in n-Channel Organic Field-Effect Transistors with C
 60
 :C
 70
 Co-Crystals Induced by Poly(2-ethyl-2-oxazoline) Nanodots

Sungho Nam; Dongyoon Khim; Gerardo T. Martinez; Aakash Varambhia; Peter D. Nellist; Youngkyoo Kim; Thomas D. Anthopoulos; Donal Bradley

doi:10.1002/adma.202100421

Significant Performance Improvement in n-Channel Organic Field-Effect Transistors with C 60 :C 70 Co-Crystals Induced by Poly(2-ethyl-2-oxazoline) Nanodots

Sungho Nam, Dongyoon Khim, Gerardo T. Martinez, Aakash Varambhia, Peter D. Nellist, Youngkyoo Kim, Thomas D. Anthopoulos, Donal Bradley

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Solution-processed organic field-effect transistors (OFETs) have attracted great interest due to their potential as logic devices for bendable and flexible electronics. In relation to n-channel structures, soluble fullerene semiconductors have been widely studied. However, they have not yet met the essential requirements for commercialization, primarily because of low charge carrier mobility, immature large-scale fabrication processes, and insufficient long-term operational stability. Interfacial engineering of the carrier-injecting source/drain (S/D) electrodes has been proposed as an effective approach to improve charge injection, leading also to overall improved device characteristics. Here, it is demonstrated that a non-conjugated neutral dipolar polymer, poly(2-ethyl-2-oxazoline) (PEOz), formed as a nanodot structure on the S/D electrodes, enhances electron mobility in n-channel OFETs using a range of soluble fullerenes. Overall performance is especially notable for (C60 -Ih )[5,6]fullerene (C60 ) and (C70 -D5h(6) )[5,6]fullerene (C70 ) blend films, with an increase from 0.1 to 2.1 cm2 V-1 s-1 . The high relative mobility and eighteen-fold improvement are attributed not only to the anticipated reduction in S/D electrode work function but also to the beneficial effects of PEOz on the formation of a face-centered-cubic C60 :C70 co-crystal structure within the blend films.

Original language	English (US)
Pages (from-to)	2100421
Journal	Advanced Materials
DOIs	https://doi.org/10.1002/adma.202100421
State	Published - Jun 24 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-06-28
Acknowledged KAUST grant number(s): OSR-2018-CARF/CCF-3079, OSR-2019-CRG8-4095
Acknowledgements: S.N. and D.D.C.B. thank the University of Oxford for funding a postdoctoral research fellowship (S.N.) and laboratory facilities at the Clarendon Laboratory. D.D.C.B. also thanks the King Abdullah University of Science and Technology (KAUST) for additional support. T.D.A. thanks KAUST Research and the KAUST Solar Centre for funding (award numbers OSR-2018-CARF/CCF-3079 and OSR-2019-CRG8-4095). Y.K. acknowledges ﬁnancial support from the National Research Foundation (NRF) of Korea via grants 2018R1D1A3B07046214 and 2018R1A6A1A03024962. G.T.M. and P.D.N. further acknowledge use of characterization facilities within the David Cockayne Centre for Electron Microscopy, Department of Materials, University of Oxford with financial support from the UK Engineering and Physical Sciences Research Council (EPSRC) via EP/K040375/1 “South of England Analytical Electron Microscope” and EP/M010708/1. Additional instrument provision from the Henry Royce Institute via EP/R010145/1 is also gratefully recorded.

ASJC Scopus subject areas

Mechanics of Materials
General Materials Science
Mechanical Engineering

Access to Document

10.1002/adma.202100421

https://repository.kaust.edu.sa/bitstream/10754/669794/1/adma.202100421.pdf

Cite this

@article{ef5f3571f43c47ff802966284ddb4c11,

title = "Significant Performance Improvement in n-Channel Organic Field-Effect Transistors with C 60 :C 70 Co-Crystals Induced by Poly(2-ethyl-2-oxazoline) Nanodots",

abstract = "Solution-processed organic field-effect transistors (OFETs) have attracted great interest due to their potential as logic devices for bendable and flexible electronics. In relation to n-channel structures, soluble fullerene semiconductors have been widely studied. However, they have not yet met the essential requirements for commercialization, primarily because of low charge carrier mobility, immature large-scale fabrication processes, and insufficient long-term operational stability. Interfacial engineering of the carrier-injecting source/drain (S/D) electrodes has been proposed as an effective approach to improve charge injection, leading also to overall improved device characteristics. Here, it is demonstrated that a non-conjugated neutral dipolar polymer, poly(2-ethyl-2-oxazoline) (PEOz), formed as a nanodot structure on the S/D electrodes, enhances electron mobility in n-channel OFETs using a range of soluble fullerenes. Overall performance is especially notable for (C60 -Ih )[5,6]fullerene (C60 ) and (C70 -D5h(6) )[5,6]fullerene (C70 ) blend films, with an increase from 0.1 to 2.1 cm2 V-1 s-1 . The high relative mobility and eighteen-fold improvement are attributed not only to the anticipated reduction in S/D electrode work function but also to the beneficial effects of PEOz on the formation of a face-centered-cubic C60 :C70 co-crystal structure within the blend films.",

author = "Sungho Nam and Dongyoon Khim and Martinez, {Gerardo T.} and Aakash Varambhia and Nellist, {Peter D.} and Youngkyoo Kim and Anthopoulos, {Thomas D.} and Donal Bradley",

note = "KAUST Repository Item: Exported on 2021-06-28 Acknowledged KAUST grant number(s): OSR-2018-CARF/CCF-3079, OSR-2019-CRG8-4095 Acknowledgements: S.N. and D.D.C.B. thank the University of Oxford for funding a postdoctoral research fellowship (S.N.) and laboratory facilities at the Clarendon Laboratory. D.D.C.B. also thanks the King Abdullah University of Science and Technology (KAUST) for additional support. T.D.A. thanks KAUST Research and the KAUST Solar Centre for funding (award numbers OSR-2018-CARF/CCF-3079 and OSR-2019-CRG8-4095). Y.K. acknowledges ﬁnancial support from the National Research Foundation (NRF) of Korea via grants 2018R1D1A3B07046214 and 2018R1A6A1A03024962. G.T.M. and P.D.N. further acknowledge use of characterization facilities within the David Cockayne Centre for Electron Microscopy, Department of Materials, University of Oxford with financial support from the UK Engineering and Physical Sciences Research Council (EPSRC) via EP/K040375/1 “South of England Analytical Electron Microscope” and EP/M010708/1. Additional instrument provision from the Henry Royce Institute via EP/R010145/1 is also gratefully recorded.",

year = "2021",

month = jun,

day = "24",

doi = "10.1002/adma.202100421",

language = "English (US)",

pages = "2100421",

journal = "Advanced Materials",

issn = "0935-9648",

publisher = "Wiley",

}

TY - JOUR

T1 - Significant Performance Improvement in n-Channel Organic Field-Effect Transistors with C 60 :C 70 Co-Crystals Induced by Poly(2-ethyl-2-oxazoline) Nanodots

AU - Nam, Sungho

AU - Khim, Dongyoon

AU - Martinez, Gerardo T.

AU - Varambhia, Aakash

AU - Nellist, Peter D.

AU - Kim, Youngkyoo

AU - Anthopoulos, Thomas D.

AU - Bradley, Donal

N1 - KAUST Repository Item: Exported on 2021-06-28 Acknowledged KAUST grant number(s): OSR-2018-CARF/CCF-3079, OSR-2019-CRG8-4095 Acknowledgements: S.N. and D.D.C.B. thank the University of Oxford for funding a postdoctoral research fellowship (S.N.) and laboratory facilities at the Clarendon Laboratory. D.D.C.B. also thanks the King Abdullah University of Science and Technology (KAUST) for additional support. T.D.A. thanks KAUST Research and the KAUST Solar Centre for funding (award numbers OSR-2018-CARF/CCF-3079 and OSR-2019-CRG8-4095). Y.K. acknowledges ﬁnancial support from the National Research Foundation (NRF) of Korea via grants 2018R1D1A3B07046214 and 2018R1A6A1A03024962. G.T.M. and P.D.N. further acknowledge use of characterization facilities within the David Cockayne Centre for Electron Microscopy, Department of Materials, University of Oxford with financial support from the UK Engineering and Physical Sciences Research Council (EPSRC) via EP/K040375/1 “South of England Analytical Electron Microscope” and EP/M010708/1. Additional instrument provision from the Henry Royce Institute via EP/R010145/1 is also gratefully recorded.

PY - 2021/6/24

Y1 - 2021/6/24

N2 - Solution-processed organic field-effect transistors (OFETs) have attracted great interest due to their potential as logic devices for bendable and flexible electronics. In relation to n-channel structures, soluble fullerene semiconductors have been widely studied. However, they have not yet met the essential requirements for commercialization, primarily because of low charge carrier mobility, immature large-scale fabrication processes, and insufficient long-term operational stability. Interfacial engineering of the carrier-injecting source/drain (S/D) electrodes has been proposed as an effective approach to improve charge injection, leading also to overall improved device characteristics. Here, it is demonstrated that a non-conjugated neutral dipolar polymer, poly(2-ethyl-2-oxazoline) (PEOz), formed as a nanodot structure on the S/D electrodes, enhances electron mobility in n-channel OFETs using a range of soluble fullerenes. Overall performance is especially notable for (C60 -Ih )[5,6]fullerene (C60 ) and (C70 -D5h(6) )[5,6]fullerene (C70 ) blend films, with an increase from 0.1 to 2.1 cm2 V-1 s-1 . The high relative mobility and eighteen-fold improvement are attributed not only to the anticipated reduction in S/D electrode work function but also to the beneficial effects of PEOz on the formation of a face-centered-cubic C60 :C70 co-crystal structure within the blend films.

AB - Solution-processed organic field-effect transistors (OFETs) have attracted great interest due to their potential as logic devices for bendable and flexible electronics. In relation to n-channel structures, soluble fullerene semiconductors have been widely studied. However, they have not yet met the essential requirements for commercialization, primarily because of low charge carrier mobility, immature large-scale fabrication processes, and insufficient long-term operational stability. Interfacial engineering of the carrier-injecting source/drain (S/D) electrodes has been proposed as an effective approach to improve charge injection, leading also to overall improved device characteristics. Here, it is demonstrated that a non-conjugated neutral dipolar polymer, poly(2-ethyl-2-oxazoline) (PEOz), formed as a nanodot structure on the S/D electrodes, enhances electron mobility in n-channel OFETs using a range of soluble fullerenes. Overall performance is especially notable for (C60 -Ih )[5,6]fullerene (C60 ) and (C70 -D5h(6) )[5,6]fullerene (C70 ) blend films, with an increase from 0.1 to 2.1 cm2 V-1 s-1 . The high relative mobility and eighteen-fold improvement are attributed not only to the anticipated reduction in S/D electrode work function but also to the beneficial effects of PEOz on the formation of a face-centered-cubic C60 :C70 co-crystal structure within the blend films.

UR - http://hdl.handle.net/10754/669794

UR - https://onlinelibrary.wiley.com/doi/10.1002/adma.202100421

U2 - 10.1002/adma.202100421

DO - 10.1002/adma.202100421

M3 - Article

C2 - 34165833

SN - 0935-9648

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JO - Advanced Materials

JF - Advanced Materials

ER -