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Open AccessArticle

Evolutionary Computation for Parameter Extraction of Organic Thin-Film Transistors Using Newly Synthesized Liquid Crystalline Nickel Phthalocyanine

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Departamento de Electrónica y Tecnología de los Computadores, Centro de Investigación en Tecnologías de la Información y de las Comunicaciones (CITIC), Universidad de Granada, 18071 Granada, Spain
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Departamento de Arquitectura y Tecnología de Computadores, Centro de Investigación en Tecnologías de la Información y de las Comunicaciones (CITIC), Universidad de Granada, 18071 Granada, Spain
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Department of Physics, Savitribai Phule Pune University, Pune 411007, India
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School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK
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Department of Electronic and Computer Engineering, Brunel University London, Uxbridge UB8 3PH, UK
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Department of Electrical and Computer Engineering, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4K1, Canada
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Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
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Author to whom correspondence should be addressed.
Micromachines 2019, 10(10), 683; https://doi.org/10.3390/mi10100683
Received: 5 September 2019 / Revised: 3 October 2019 / Accepted: 7 October 2019 / Published: 10 October 2019
In this work, the topic of the detrimental contact effects in organic thin-film transistors (OTFTs) is revisited. In this case, contact effects are considered as a tool to enhance the characterization procedures of OTFTs, achieving more accurate values for the fundamental parameters of the transistor threshold voltage, carrier mobility and on-off current ratio. The contact region is also seen as a fundamental part of the device which is sensitive to physical, chemical and fabrication variables. A compact model for OTFTs, which includes the effects of the contacts, and a recent proposal of an associated evolutionary parameter extraction procedure are reviewed. Both the model and the procedure are used to assess the effect of the annealing temperature on a nickel-1,4,8,11,15,18,22,25-octakis(hexyl)phthalocyanine (NiPc6)-based OTFT. A review of the importance of phthalocyanines in organic electronics is also provided. The characterization of the contact region in NiPc6 OTFTs complements the results extracted from other physical–chemical techniques such as differential scanning calorimetry or atomic force microscopy, in which the transition from crystal to columnar mesophase imposes a limit for the optimum performance of the annealed OTFTs. View Full-Text
Keywords: contact effects; evolutionary multi-objective optimization; modeling; nickel phthalocyanine; thin-film transistor; device parameters contact effects; evolutionary multi-objective optimization; modeling; nickel phthalocyanine; thin-film transistor; device parameters
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MDPI and ACS Style

Jiménez-Tejada, J.A.; Romero, A.; González, J.; Chaure, N.B.; Cammidge, A.N.; Chambrier, I.; Ray, A.K.; Deen, M.J. Evolutionary Computation for Parameter Extraction of Organic Thin-Film Transistors Using Newly Synthesized Liquid Crystalline Nickel Phthalocyanine. Micromachines 2019, 10, 683.

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