Patent ID: 6429039
Filing Date: 2002-08-06
Classification: H01L,Y02E

Abstract:
A manufacturing method of 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 of a first conduction type that is one of a P- and 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 manufacturing method comprising the steps of:forming a gate oxide film and a gate electrode on a surface of a first conduction type substrate adjusted for said first conduction type; forming a concave portion in a region of said first conduction type substrate, said region being contiguous to said gate electrode; forming on said first conduction type substrate a second conduction type drain region on the opposite side of said gate electrode from said concave portion; implanting second conduction type impurities into said first conduction type substrate at a first angle relative to the substrate in order to form a second conduction type region which includes a region underneath said concave portion and which is provided in a partially submerged manner underneath said gate oxide film; and implanting first conduction type impurities into said first conduction type substrate at a second angle relative to the substrate in order to form a first conduction type region which includes a region underneath said concave portion and which covers said second conduction type region, said first conduction type region and said second conduction type region together constituting said PN junction diode.