Patent ID: 9236262
Filing Date: 2016-01-12
CPC Classification: H01L

Claim Text:
1. A method for producing a double-gate field-effect device comprising the following successive steps: providing a substrate successively provided with a support, a first layer made from a first material, a second layer made from a semiconductor material and an etching mask, the second layer and the etching mask defining distinct first, second and third patterns on the first material, forming a lateral spacer surrounding each of the first, second and third patterns, the lateral spacer making the connection between the first and third patterns, eliminating the first layer so as to suspend at least a part of the first pattern and to define a cavity having an access opening between the first and second patterns, eliminating the first etching mask at least in the first, second and third patterns, forming a gate dielectric on two opposite main surfaces of the first pattern made from the second layer, depositing a resist in the cavity and on the first pattern made from the second layer, forming, in the resist, a first hole inside the cavity to define a future bottom gate and a second hole defining a future top gate on the first pattern, forming an electrically conducting material in the cavity and on the first pattern made from the second layer so as to form the bottom gate and the top gate separated by the first pattern made from the second layer.