Patent ID: 6278145
Filing Date: 2001-08-21
Classification: H01L,Y02E

Abstract:
A semiconductor device including a PN junction diode and a control transistor, said PN junction diode functioning as a photo diode and comprising a semiconductor having a first conduction type, that is one of a P- or an N-type and another semiconductor of a second conduction type, that is the other of the two types, said control transistor controlling transfer of a light signal carrier generated within said PN junction diode, said semiconductor device comprising:a first conduction type substrate having a first conduction type;a gate oxide film and a gate electrode furnished on a surface of said first conduction type substrate;at least one concave portion in a region of said first conduction type substrate, said region being contiguous to said gate electrode, said concave portion including said PN junction diode comprising a second conductivity type region partially underneath said gate oxide film and in said first conduction type substrate and a first conductivity type region covering said second conductivity type region; anda drain region having a second conduction type disposed on the opposite side of said gate electrode from said concave portion.