Patent ID: 6326658
Filing Date: 2001-12-04
Classification: H01L

Abstract:
A semiconductor device comprising:a single crystal semiconductor substrate;a polycrystalline semiconductor film formed on said single crystal semiconductor substrate; anda conductive interface layer formed between said single crystal semiconductor substrate and said polycrystalline semiconductor film and formed of a material different from constituent materials of said single crystal semiconductor substrate and said polycrystalline semiconductor film,wherein a trench is formed in a surface of said single crystal semiconductor substrate, said polycrystalline semiconductor film is formed in said trench, and said interface layer is formed between a side wall of said trench and said polycrystalline semiconductor film, andwherein said single crystal semiconductor substrate is formed of a single crystal silicon substrate, said polycrystalline semiconductor film is formed of a polysilicon film, and said interface layer is formed of a silicon nitride layer having a chlorine concentration of not less than 4.times.10.sup.20 cm.sup.-3.