Patent ID: 8685819

Claim:
A method for manufacturing a crossbar array of crossed conductive or semi-conductive access lines on a substrate, the crossbar array comprising: on a crossbar array insulator, in a plane parallel to the substrate, a first level of lines comprising a plurality of first lines parallel to each other made of a conductive or semi-conductive material; above the first level of lines, a second level of lines comprising a plurality of second lines parallel to each other made of a conductive or semi-conductive material, the second lines being substantially perpendicular to the first lines, said method comprising: forming, on the substrate, a first cavity of substantially rectangular shape; forming a second cavity of substantially rectangular shape superimposed to the first cavity, the first and second cavities intersecting each other perpendicularly so as to form a resultant cavity; covering a base of the resultant cavity by a layer of a first diblock copolymer comprising an array of lines formed by an alternation of lines of a first polymer and of lines of a second polymer, the lines being arranged parallel following the length of the second cavity; withdrawing the lines of first polymer so as to form an alternation of first grooves and of lines of second polymer; performing a conformal deposition of a layer of a first conductive or semi-conductive material on the grooves and the lines of second polymer; withdrawing the lines of second polymer covered by the first conductive or semi-conductive material so as to form the first level of lines; withdrawing selectively the material forming the second cavity so as to make accessible the base of the first cavity covered partially following its width by the first level of lines; depositing in the first cavity, which has been made accessible, a layer of a second conductive or semi-conductive material; covering the layer of second conductive or semi-conductive material, by a layer of a second diblock copolymer comprising an array of lines formed by an alternation of lines of a third polymer and of lines of a fourth polymer, the lines being substantially perpendicular to the first lines and second lines of polymers; withdrawing the lines of fourth polymer so as to form an alternation of second grooves and of lines of third polymer; withdrawing in the second grooves the second conductive or semi-conductive material so as to realize form the second level of lines.