Organic thin film transistors using a liquid crystalline palladium phthalocyanine as active layer

Jiménez Tejada, Juan A., Lopez-Varo, Pilar, Chaure, Nandu B., Chambrier, Isabelle, Cammidge, Andrew N., Cook, Michael J., Jafari-Fini, Ali and Ray, Asim K. (2018) Organic thin film transistors using a liquid crystalline palladium phthalocyanine as active layer. Journal of Applied Physics, 123 (11). ISSN 0021-8979

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    Abstract

    70 nm thick solution-processed films of a palladium phthalocyanine (PdPc6) derivative bearing eight hexyl (–C6H13) chains at non-peripheral positions have been employed as active layers in the fabrication of bottom-gate bottom-contact organic thin film transistors (OTFTs) deposited on highly doped p-type Si (110) substrates with SiO2 gate dielectric. The dependence of the transistor electrical performance upon the mesophase behavior of the PdPc6 films has been investigated by measuring the output and transfer characteristics of the OTFT having its active layer ex situ vacuum annealed at temperatures between 500 C and 200 C. A clear correlation between the annealing temperature and the threshold voltage and carrier mobility of the transistors, and the transition temperatures extracted from the differential scanning calorimetric curves for bulk materials has been established. This direct relation has been obtained by means of a compact electrical model in which the contact effects are taken into account. The precise determination of the contact-voltage drain-current curves allows for obtaining such a relation.

    Item Type: Article
    Uncontrolled Keywords: phthalocyanines,molecular electronics,materials chemistry
    Faculty \ School: Faculty of Science > School of Chemistry
    Depositing User: Pure Connector
    Date Deposited: 05 Apr 2018 15:30
    Last Modified: 12 Dec 2018 01:07
    URI: https://ueaeprints.uea.ac.uk/id/eprint/66684
    DOI: 10.1063/1.5017472

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