Patent ID: 8283236

Claim:
A method of forming a capacitor, comprising: forming an initial storage node structure over a semiconductor substrate; the initial storage node structure being container-shaped and having a bottom, a top, and a height from the bottom to the top; the initial storage node structure comprising a base at said bottom; the initial storage node structure comprising, along a cross-section, a pair of sidewalls extending upwardly from said base to said top; converting the initial storage node structure into a modified storage node structure by reducing thicknesses of upper segments of the sidewalls while leaving thicknesses of lower segments of the sidewalls substantially unchanged; the modified storage node structure being container-shaped, having an upper region and a lower region, and having wider sidewall segments in the lower region and narrower sidewall segments in the upper region; forming capacitor dielectric material along a surface of the modified storage node structure; and forming capacitor electrode material over the capacitor dielectric material, with the capacitor electrode material being capacitively coupled to the modified storage node structure through the capacitor dielectric material.