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• Journal article
  Chen C, Jacobs IE, Jellett C, Jiao X, Ponder JF, Kang B, Lee SB, Huang Y, Zhang L, Statz M, Sun Y, Lin Y, Kang K, She X, Hu Y, Zhang T, Jiang L, McNeill CR, McCulloch I, Sirringhaus Het al., 2022,

  Single Atom Selenium Substitution-Mediated P-Type Doping in Polythiophenes toward High-Performance Organic Electronics and Thermoelectrics

  , ADVANCED ELECTRONIC MATERIALS, Vol: 8, ISSN: 2199-160X
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  • Citations: 6
• Journal article
  Sarkar T, Lieberth K, Pavlou A, Frank T, Mailaender V, McCulloch I, Blom PWM, Torricelli F, Gkoupidenis Pet al., 2022,

  An organic artificial spiking neuron for in situ neuromorphic sensing and biointerfacing (Nov, 10.1038/s41928-022-00859-y, 2022)

  , NATURE ELECTRONICS, Vol: 5, Pages: 821-821, ISSN: 2520-1131
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• Journal article
  Maria IP, Griggs S, Rashid RB, Paulsen BD, Surgailis J, Thorley K, Le VN, Harrison GT, Combe C, Hallani R, Giovannitti A, Paterson AF, Inal S, Rivnay J, McCulloch Iet al., 2022,

  Enhancing the Backbone Coplanarity of n-Type Copolymers for Higher Electron Mobility and Stability in Organic Electrochemical Transistors

  , CHEMISTRY OF MATERIALS, Vol: 34, Pages: 8593-8602, ISSN: 0897-4756
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  • Citations: 31
• Journal article
  Lin C-T, Hsieh C-T, Macdonald TJ, Chang J-F, Lin P-C, Cha H, Steier L, Wadsworth A, McCulloch I, Chueh C-C, Durrant JRet al., 2022,

  Water-Insensitive Electron Transport and Photoactive Layers for Improved Underwater Stability of Organic Photovoltaics

  , ADVANCED FUNCTIONAL MATERIALS, Vol: 32, ISSN: 1616-301X
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  • Citations: 19
• Journal article
  Druet V, Nayak PD, Koklu A, Ohayon D, Hama A, Chen X, Moser M, McCulloch I, Inal Set al., 2022,

  Operation Mechanism of n-Type Organic Electronic Metabolite Sensors

  , ADVANCED ELECTRONIC MATERIALS, Vol: 8, ISSN: 2199-160X
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  • Citations: 3
• Journal article
  Siemons N, Pearce D, Cendra C, Yu H, Tuladhar SM, Hallani RK, Sheelamanthula R, LeCroy GS, Siemons L, White AJP, Mcculloch I, Salleo A, Frost JM, Giovannitti A, Nelson Jet al., 2022,

  Impact of side chain hydrophilicity on packing, swelling and ion interactions in oxy-bithiophene semiconductors.

  , Advanced Materials, Vol: 34, ISSN: 0935-9648

  Exchanging hydrophobic alkyl-based side chains to hydrophilic glycol-based side chains is a widely adopted method for improving mixed-transport device performance, despite the impact on solid state packing and polymer-electrolyte interactions being poorly understood. Presented here is a Molecular Dynamics (MD) force field for modelling alkoxylated and glycolated polythiophenes. The force field is validated against known packing motifs for their monomer crystals. MD simulations, coupled with X-ray Diffraction (XRD), show that alkoxylated polythiophenes will pack with a 'tilted stack' and straight interdigitating side chains, whilst their glycolated counterpart will pack with a 'deflected stack' and an s-bend side chain configuration. MD simulations reveal water penetration pathways into the alkoxylated and glycolated crystals - through the π-stack and through the lamellar stack respectively. Finally, the two distinct ways tri-ethylene glycol polymers can bind to cations are revealed, showing the formation of a meta-stable single bound state, or an energetically deep double bound state, both with a strong side chain length dependance. The minimum energy pathways for the formation of the chelates are identified, showing the physical process through which cations can bind to one or two side chains of a glycolated polythiophene, with consequences for ion transport in bithiophene semiconductors. This article is protected by copyright. All rights reserved.

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• Journal article
  Stein E, Nahor O, Stolov M, Freger V, Petruta IM, McCulloch I, Frey GLet al., 2022,

  Ambipolar blend-based organic electrochemical transistors and inverters

  , NATURE COMMUNICATIONS, Vol: 13
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  • Citations: 13
• Journal article
  Zhu G, Chen J, Duan J, Liao H, Zhu X, Li Z, McCulloch I, Yue Wet al., 2022,

  Fluorinated Alcohol-Processed N-Type Organic Electrochemical Transistor with High Performance and Enhanced Stability

  , ACS APPLIED MATERIALS & INTERFACES, ISSN: 1944-8244
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  • Citations: 7
• Journal article
  Zhao Y, Su C, Shen G, Xie Z, Xiao W, Fu Y, Inal S, Wang Q, Wang Y, Yue W, McCulloch I, He Det al., 2022,

  Donor Engineering Tuning the Analog Switching Range and Operational Stability of Organic Synaptic Transistors for Neuromorphic Systems

  , ADVANCED FUNCTIONAL MATERIALS, Vol: 32, ISSN: 1616-301X
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  • Citations: 14
• Journal article
  Koklu A, Wustoni S, Guo K, Silva R, Salvigni L, Hama A, Diaz-Galicia E, Moser M, Marks A, McCulloch I, Grunberg R, Arold ST, Inal Set al., 2022,

  Convection Driven Ultrarapid Protein Detection via Nanobody-Functionalized Organic Electrochemical Transistors

  , ADVANCED MATERIALS, Vol: 34, ISSN: 0935-9648
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  • Citations: 17
• Journal article
  Tan STM, Lee G, Denti I, LeCroy G, Rozylowicz K, Marks A, Griggs S, McCulloch I, Giovannitti A, Salleo Aet al., 2022,

  Tuning Organic Electrochemical Transistor Threshold Voltage using Chemically Doped Polymer Gates

  , ADVANCED MATERIALS, Vol: 34, ISSN: 0935-9648
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  • Citations: 8
• Journal article
  Tan STM, Giovannitti A, Marks A, Moser M, Quill TJ, McCulloch I, Salleo A, Bonacchini GEet al., 2022,

  Conjugated Polymers for Microwave Applications: Untethered Sensing Platforms and Multifunctional Devices

  , ADVANCED MATERIALS, Vol: 34, ISSN: 0935-9648
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  • Citations: 8
• Journal article
  Duan J, Zhu G, Wang L, Chen J, Cong S, Zhu X, Zhou Y, Li Z, McCulloch I, Yue Wet al., 2022,

  Highly Efficient Mixed Conduction in N-type Fused Small Molecule Semiconductors

  , ADVANCED FUNCTIONAL MATERIALS, Vol: 32, ISSN: 1616-301X
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  • Citations: 11
• Journal article
  Castillo TCH, Moser M, Cendra C, Nayak PD, Salleo A, McCulloch I, Inal Set al., 2022,

  Simultaneous Performance and Stability Improvement of a p-Type Organic Electrochemical Transistor through Additives

  , CHEMISTRY OF MATERIALS, ISSN: 0897-4756
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  • Citations: 5
• Journal article
  Nugraha MI, Gedda M, Firdaus Y, Scaccabarozzi AD, Zhang W, Alshammari S, Anies F, Adilbekova B, Emwas A-H, McCulloch I, Heeney M, Tsetseris L, Anthopoulos TDet al., 2022,

  Addition of diquat enhances the electron mobility in various non-fullerene acceptor molecules

  , Advanced Functional Materials, ISSN: 1616-301X

  Molecular doping of organic semiconductors is often used to enhance their charge transport characteristics. Despite its success, however, most studies to date concern p-doping with considerably fewer reports involving n-dopants. Here, n-doping of organic thin-film transistors (OTFTs) based on several non-fullerene acceptor (NFA) molecules using the recently developed diquat (DQ) as a soluble molecular dopant is reported. The low ionization potential of DQ facilitates efficient electron transfer and subsequent n-doping of the NFAs, resulting in a consistent increase in the electron field-effect mobility. Solution-processed BTP-eC9 and N3-based OTFTs exhibit significant increase in the electron mobility upon DQ doping, with values increasing from 0.02 to 0.17 cm2 V–1 s–1 and from 0.2 to 0.57 cm2 V–1 s–1, respectively. A remarkable electron mobility of >1 cm2 V–1 s–1 is achieved for O-IDTBR transistors upon optimal doping with DQ. The enhanced performance originates primarily from synergistic effects on electronic transport and changes in morphology, including: i) significant reduction of contact resistances, ii) formation of larger crystalline domains, iii) change of preferred crystal orientation, and iv) alteration in molecular packing motif. This work demonstrates the universality of DQ as an electronic additive for improving electron transport in OTFTs.

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