Patent ID: 9157888
Filing Date: 2015-10-13
Classification: G01N,H01L

Abstract:
1. A field effect transistor for chemical sensing, comprising a drain electrode, a source electrode, an electrically insulating graphene layer substrate, a continuous monocrystalline graphene layer arranged on said graphene layer substrate, the monocrystalline graphene layer at least partially defining an electrically conducting and chemically sensitive channel, said monocrystalline graphene layer and said chemically sensitive channel extending between and being electrically connected to said drain electrode and source electrode, and a gate electrode being arranged at a distance from and opposite to said chemically sensitive conducting channel so that the gate electrode and the monocrystalline graphene layer together with the drain and source electrodes define a gap in which the gate electrode and chemically sensitive conducting channel face one another on opposite sides of the gap in a first direction, and in which the drain and source electrodes face one another on opposite sides of the gap in a second direction perpendicular to the first direction, and through which a chemical to be sensed is introducible to reach the chemically sensitive channel within the gap, wherein the gate electrode is arranged on an electrically insulating surface of a gate substrate, and the chemically sensitive channel and the graphene layer substrate are spaced apart from the gate substrate by the drain and source electrodes, and wherein the chemically sensitive channel and the graphene layer substrate belong to a first separate part that is mounted to a second separate part comprising at least the gate electrode.