Patent ID: 6791160
Filing Date: 2004-09-14
Classification: H01L

Abstract:
A semiconductor device having a capacitive element and a photodiode mounted together on a same semiconductor substrate, the semiconductor device comprising:a first semiconductor layer of a same conductivity type as semiconductor substrate and having a lower impurity concentration than the semiconductor substrate formed on the semiconductor substrate, the first semiconductor layer formed as a common layer in a capacitive element forming region and a photodiode forming region, a first portion of the first semiconductor layer formed in the capacitive element forming region and a second portion of the first semiconductor layer formed in the photodiode forming region, the second portion being one of an anode and a cathode; the capacitive element having a lower electrode layer, a dielectric layer, and an upper electrode layer, which are sequentially laminated on the first portion of the first semiconductor layer, with an insulating film interposed between the capacitive element and first portion of the first semiconductor layer; a second semiconductor layer having a conductivity type opposite to the first semiconductor layer formed on the second portion of the first semiconductor layer and being one of an anode and a cathode opposite the second portion of the first semiconductor layer; and a third semiconductor layer having a same conductivity type as the semiconductor substrate and a higher impurity concentration than the semiconductor substrate formed between the semiconductor substrate and the first semiconductor layer, the third semiconductor layer formed in the photodiode forming region and not formed in the capacitive element forming region.