Evolutionary Computation for Parameter Extraction of Organic Thin-Film Transistors Using Newly Synthesized Liquid Crystalline Nickel Phthalocyanine
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AuthorJiménez Tejada, Juan Antonio; Romero, Adrián; González Peñalver, Jesús; Chaure, Nandu B.; Cammidge, Andrew N.; Chambrier, Isabelle; Ray, Asim K.; Deen, Jamal
Contact effectsEvolutionary multi-objective optimizationModelingNickel phthalocyanineThin-film transistorDevice parameters
Juan A. Jiménez-Tejada, Adrián Romero, Jesús González, Nandu B. Chaure, Andrew N. Cammidge, Isabelle Chambrier, Asim K. Ray and M. Jamal Deen, "Evolutionary Computation for Parameter Extraction of Organic Thin-Film Transistors Using Newly Synthesized Liquid Crystalline Nickel Phthalocyanine", Micromachines 2019, 10, 683 [doi:10.3390/mi10100683]
SponsorshipThis work was supported by projects MAT2016-76892-C3-3-R, TIN2015-67020-P and PGC2018-098813-B-C31 funded by the Spanish Government and “European Regional Development Funds (ERDF)”. The experimental work was carried out at Queen Mary, University of London under financial support from the UK Technology Strategy Board (Project No: TP/6/EPH/6/S/K2536J). This work was also supported by NSERC Green Electronics Network (GreEN) (grant number: NETGP 508526-17).
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.