Electronic device array

A method of producing an array of electronic devices, the method including the steps of: forming one or more first conductive elements of a first electronic device on a substrate and one or more second conductive elements of a second electronic device on said substrate; and forming a layer of channel material over the substrate and the first and second conductive elements to provide a first channel for, in use, the movement of charge carriers between conductive elements of said first electronic device and a second channel for, in use, the movement of charge carriers between conductive elements of said second electronic device; wherein the method also includes the step (a) of using an irradiative technique to decrease in a single step the conductivity of one or more selected portions of the layer of channel material in one or more regions between the first and second conductive elements.