Patent ID: 7915118

Claim:
A method of fabricating a nonvolatile memory device, the method comprising: forming a floating gate electrode on a semiconductor substrate, the floating gate electrode including an acute-angled tip at an upper end; and forming a control gate electrode insulated from the floating gate electrode, and facing at least a portion of the floating gate electrode, an angle formed between the semiconductor substrate and an upper portion of a lateral surface of the floating gate electrode being smaller than an angle formed between the semiconductor substrate and a lower portion of the lateral surface of the floating gate electrode, wherein forming the floating gate electrode includes: forming a stacked structure with a sacrificial film and a mask film, the stacked structure having an opening on the semiconductor substrate; forming a sacrificial spacer film on the stacked structure having the opening and the semiconductor substrate, the sacrificial spacer film and the sacrificial film being formed of a same material; forming a sacrificial spacer on a side of the opening by etching the sacrificial spacer film while the mask film protects the sacrificial film; forming a floating gate conductive film inside the opening where the sacrificial spacer is formed, the mask film being removed after forming the floating gate conductive film inside the opening; and removing the sacrificial film and the sacrificial spacer.