IMAGE SENSOR WITH RECESSED PLANARIZING LAYERS AND METHOD FOR MAKING SAME

摘要

The invention concerns a method for making image sensors, and in particular colour image sensors. The image sensor comprises a zone (MP) whereon is located a photosensitive matrix on which is projected the image to be converted into electric signals, and an outer zone (ZE) including peripheral electronic circuits, for controlling the matrix or for processing image signals. After forming on a substrate (30) a stack of conductive layers and insulating layers for producing the matrix and the peripheral circuits, it consists in removing only in the zone (MP) of the matrix a substantial thickness of insulation before depositing a mosaic of coloured filters, so as to reduce the height H1 of the filters relative to the photosensitive zones, thereby improving contrast and colorimetry.