Method of producing a junction field-effect transistor (JFET)

Abstract

The invention concerns a method for producing a field effect transistor having a trench gate comprising: • - the forming (110) of at least one trench (11, 12, 13) in a semi-conductive substrate (1) having a first type of conductivity, said substrate comprising two opposing faces called front face and rear face, • - the primary implantation (120) of ions having a second type of conductivity so as to implant each trench of the substrate to form an active gate area, • - the depositing (160) of a layer of polycrystalline silicon having the second type of conductivity on the implanted active gate area, • - the oxidation (160) of the layer of polycrystalline silicon, and • - the metallisation (180) of the substrate on the front and rear faces of same in order to form active source and drain areas