A method of making an assembly includes the steps of applying metallic nanoparticles to exposed surfaces of conductive elements of either of or both of a first component and a second component, juxtaposing the conductive elements of the first component with the conductive elements of the second component with the metallic nanoparticles disposed therebetween, and elevating a temperature at least at interfaces of the juxtaposed conductive elements to a joining temperature at which the metallic nanoparticles cause metallurgical joints to form between the juxtaposed conductive elements. The conductive elements of either of or both of the first component and the second component can include substantially rigid posts having top surfaces projecting a height above the surface of the respective component and edge surfaces extending at substantial angles away from the top surfaces thereof.