ORGANIC SEMICONDUCTING LAYERS

摘要

An organic semiconducting layer formulation, which comprises: an organic binder which has a permittivity, epsilon, at 1,000 Hz of 3.3 or less; and a polyacene compound of Formula: A: wherein: each of R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈, R₉, R₁₀, R₁₁ and R₁₂, which may be the same or different, independently represents hydrogen; an optionally substituted C₁-C₄₀ carbyl or hydrocarbyl group; an optionally substituted C₁-C₄₀ alkoxy group; an optionally substituted C₆-C₄₀ aryloxy group; an optionally substituted C₇-C₄₀ alkylaryloxy group; an optionally substituted C₂-C₄₀ alkoxycarbonyl group; an optionally substituted C₇-C₄₀ aryloxycarbonyl group; a cyano group (-CN); a carbamoyl group (-C(-O)NII₂); a haloformyl group (-C(-O)-X, wherein X represents a halogen atom); a formyl group (-C(-O)-H); an isocyano group; an isocyanate group; a thiocyanate group or a thioisocyanate group; an optionally substituted amino group; a hydroxy group; a nitro group; a CF₃ group; a halo group (Cl, Br, F); or an optionally substituted silyl group; and wherein independently each pair of R₂ said R₃ and/or R₈ and R₉, may be cross-bridged to form a C₄-C₄₀ saturated or unsaturated ring, which saturated or unsaturated ring may be intervened by an oxygen atom, a sulphur atom or a group shown by formula -N(R_a)- (wherein R_a is a hydrogen atom or an optionally substituted hydrocarbon group), or may optionally be substituted; and wherein one or more of the carbon atoms of the polyacene skeleton may optionally be substituted by a heteroatom selected from N, P, As, O, S, Se and Te; and wherein independently any two or more of the substituent R₁-R₁₂ which are located on adjacent ring positions of the polyacene may, together, optionally constitute a further C₄-C₄₀ saturated or unsaturated ring optionally interrupted by O, S or -N(R_a) where R_a is as defined above) or an aromatic ring system, fused to the polyacene; and wherein n is 0, 1, 2, 3 or 4, also claimed is an electronic device, particularly an organic field effect transistor comprising the organic semiconductor layer formulation.