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New Organic Functional Material "Picene"

Picene (1), whose benzene rings are condensed in a w-shaped, is an aromatic hydrocarbon compound. Recently, Kubozono et al. have reported an efficiency modification of Field-effect transistors (FETs) with 1. Applying 1 into the active layer of FETs resulted in the field-effect mobility value (μ value) being measured 1.1 cm2V-1s-1. Furthermore, the μ value is improved up to 1.75 cm2V-1s-1 after exposure to O2 atmosphere for 70 hours. This result showed that the modified FET is an O2-assisted devise, as well as having stability against O2.1) In addition, Kubozono et al. have also reported the superconductivity of 1 which was intercalated with alkaline metals, such as potassium and rubidium. The Tc (superconducting transition temperature) was 18 K (–255 °C) when 1 was doped with 3.3 equivalents of potassium (based on 1). This value is the highest one ever for simple and typical organic compounds.2)

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