Neuromimetic network and related production method
The present invention relates to a neuromimetic network comprising a set of neurons and a set of synapses, at least one neuron comprising a first stack of superimposed layers, the first stack successively comprising: a first electrode, a first barrier layer made of an electrically insulating material, and a second electrode, the first electrode, the first barrier layer and the second electrode forming a first ferroelectric tunnel junction, at least one synapse comprising a second stack of superimposed layers, the second stack successively comprising: a third electrode, a second barrier layer made of an electrically insulating material, and a fourth electrode, the third electrode, the second barrier layer and the fourth electrode forming a second ferroelectric tunnel junction.
1. A neuromimetic network comprising a substrate, a set of neurons and a set of synapses,
at least one neuron comprising a first stack of superimposed layers in a first stacking direction, the first stack successively comprising, in the first stacking direction:
a first electrode supported by the substrate,
a first barrier layer made of an electrically insulating material, and
a second electrode,
the first electrode, the first barrier layer and the second electrode forming a first ferroelectric tunnel junction,
at least one synapse comprising a second stack of superimposed layers in at least a second stacking direction, the second stack successively comprising, in the second stacking direction:
a third electrode supported by the substrate,
a second barrier layer made of an electrically insulating material, and
a fourth electrode,
the third electrode, the second barrier layer and the fourth electrode forming a second ferroelectric tunnel junction.
2. The neuromimetic network according to claim 1 , wherein the first barrier layer is made of a ferroelectric material and has a single-pole polarization cycle.
3. The neuromimetic network according to claim 1 , wherein the first barrier layer is made from an anti-ferroelectric material.
4. The neuromimetic network according to claim 3 , wherein the second barrier layer is made of a ferroelectric material made up of atoms of a set of elements and the anti-ferroelectric material making up the first barrier layer comprises atoms of each element from the set of elements, the anti-ferroelectric material further comprising atoms of an additional element not belonging to the set of elements.
5. The neuromimetic network according to claim 1 , wherein the first electrode is made from a first conductive material and the second electrode is made from a second conductive material different from the first conductive material.
6. The neuromimetic network according to claim 1 , wherein at least one neuron comprises an electro-resistive component having a variable electrical resistance, the electro-resistive component being electrically connected to an electrode of the corresponding first stack, the neuron being configured to receive an electric current passing through the electro-resistive component, the electric current further successively passing through all of the layers of the first stack in the first stacking direction.
7. A method for manufacturing a neuromimetic network according to claim 1 , the method comprising the steps for:
obtaining a first set of first electrodes supported by the substrate, and a second set of electrodes, called third electrodes, supported by the substrate,
depositing an electrically insulating barrier layer on each first electrode and each third electrode,
forming an electrode, called second electrode, on each barrier layer of the first set to form a set of neurons, and forming a fourth electrode on each barrier layer of the second set to form a set of synapses, each barrier layer forming, with the corresponding electrodes, a ferroelectric tunnel junction.
8. A method for manufacturing a neuromimetic network according to claim 7 , wherein each barrier layer deposited during the depositing step is made from a ferroelectric material,
the manufacturing method further comprising, before the forming step, a step for inserting atoms of at least one additional element into each barrier layer of the first set in order to transform the ferroelectric material of the barrier layers of the first set into an anti-ferroelectric material.
9. The method for manufacturing a neuromimetic network according to claim 8 , wherein the insertion step comprises implanting atoms of the additional element into each barrier layer of the first set.
10. The method for manufacturing a neuromimetic network according to claim 7 , wherein the forming step comprises:
depositing an electrically conductive material, called second conductive material, on each barrier layer of the first set in order to form the corresponding second electrode, and
depositing an electrically conductive material, called third conductive material, on each barrier layer of the second set in order to form the corresponding fourth electrode, the third conductive material being different from the second conductive material.