Patent ID: 6437370
Filing Date: 2002-08-20
Classification: H01L

Abstract:
An image sensor comprising:a thin film transistor (TFT) on top of a transparent substrate, said TFT having an electrical contact region; a first interlayer film covering said TFT; a photodiode (PD) having a lower electrode on said first interlayer film; a second interlayer film covering said PD and said lower electrode, said second interlayer film having a peripheral edge between said lower electrode and said TFT, said first and second interlayer films being different materials; a first contact hole that extends through said first interlayer film to said electrical contact region of said TFT; a second contact hole that extends through said second interlayer film to said lower electrode of said PD; and an electrical interconnection layer that extends through said first contact hole into contact with said electrical contact region, across a top surface of said first interlayer film, over said peripheral edge of said second interlayer film, and through said second contact hole into contact with said lower electrode, wherein an area on said top surface of said first interlayer film that is adjacent to said first contact hole is not covered by said second interlayer film, and wherein said electrical contact region is a source/drain region, wherein said TFT comprises a gate electrode, wherein a portion of said second interlayer film is over said gate electrode of said TFT, and further comprising a third contact hole that extends through said first and second interlayer films to said gate electrode.