NOVELTY - An organic electronic device comprises at least two electrodes and a semiconducting layer comprising at least one hole-transporting semiconducting material and/or at least one electron-transporting semiconducting material. At least one of the semiconducting materials is in the form of semiconducting polymer brushes, which are attached to the surface of at least one of the electrodes and are optionally in contact with at least one of the other semiconducting materials.    USE - As electroluminescent devices, photovoltaic devices, field effect transistors and liquid crystal devices (claimed).    ADVANTAGE - The semiconducting polymer brushes used in the devices give excellent device characteristics as there is a large interfacial area between the polymer brushes and the other semiconducting material (or materials) with which they are in contact and they provide direct transport paths for electrons and holes to or from the electrodes to which they are attached.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of the organic electronic device involving    (1) (a) coating a substrate with a material to form one of the electrodes; (b) optionally coating the electrode thus formed with a self-assembled monolayer end-capped with an initiator group or a self-assembled monolayer forming a free radical; (c) bringing the coated electrode into contact with a solution of a monomer for the growth of polymer brushes comprising the monomer unit from the surface of the electrode; (d) treating the obtained product to produce a product in which the polymer brushes are in contact with at least one further semiconducting material; and (e) coating a material on the top surface of the product to form the further electrode; and    (2) (i) step (a); (ii) optionally coating the electrode thus formed with a layer of an electronically insulating material; (iii) steps (b) and (c); (iv) optionally coating the polymer brushes formed in (iii) with a layer of an electronically insulating material; and (v) coating a material on the top surface of the product of step (iii), or following optional step (iv), to form the further electrode.