Pragmatic Printing Limited

John James Gregory

Richard David Price

A method of manufacturing an electronic device comprising a first terminal (e.g. a source terminal), a second terminal (e.g. a drain terminal), a semiconductor channel connecting the first and second terminals and a gate terminal to which a potential may be applied to control a conductivity of the channel. The method comprises a first exposure of a photoresist from above the substrate using a mask and a second exposure from below, wherein in the second exposure the first and second terminals shield a part of the photoresist from exposure. An intermediate step reduces the solubility of the photoresist exposed in the first exposure. A window is formed in the photoresist at the location which was shielded by the mask, but exposed to radiation from below. Semiconductor material, dielectric material and conductor material are deposited inside the window to form a semiconductor channel, gate dielectric, and a gate terminal, respectively.

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March, United Kingdom

John James Gregory