Example embodiments relate to a method of forming a conductive structure. Other example embodiments relate to a method of forming a conductive structure capable of storing or transmitting electric charges. In example embodiments, when a conductive structure including first and second conductive patterns extending in a first horizontal direction is formed, at least one of the first and second conductive patterns may decreases in size. When the conductive structure is vertically bisected in a second horizontal direction perpendicular to the first horizontal direction to form conductive members, a coupling effect generated between the conductive members adjacent to each other may be reduced.