Patent ID: 6765251
Filing Date: 2004-07-20
Classification: H01L

Abstract:
A semiconductor device, comprising:a semiconductor substrate having a main surface; an element isolating region for defining an element forming region on the main surface of said semiconductor substrate; an isolation region having a strip-shape and having a peak impurity concentration at a prescribed depth position from the main surface of said semiconductor substrate; a connection hole provided piercing through said element isolating region; an anti-HF (hydrofluoric acid) side wall film not etched by hydrofluoric acid, provided to cover a side wall of said connection hole at least near a lower end of said connection hole; an interconnection layer provided to fill an inner portion of said connection hole; and an impurity region provided in said semiconductor substrate extending from the lower end of said connection hole to said isolation region, wherein said impurity region comprises a first impurity region portion provided to connect said interconnection layer to said isolation region, and a second impurity region portion provided near the lower end of said connection hole and connected to said interconnection layer, the first impurity region portion being approximately equal in width to the internal diameter of the connection hole and the width of the second impurity region portion being substantially greater than the internal diameter of the connection hole.