This invention discloses an
image sensor and its manufacturing method. The method includes: Step S1, providing a
wafer including a substrate and a plurality of gates formed on the substrate, with adjacent gates forming a gate spacer; the substrate is
ion-implanted to form an active / drain region; Step S2, depositing an
oxide layer on the surface of the gate spacer and above the gates; Step S3, performing high-temperature rapid annealing on the
wafer to activate the active / drain regions; Step S4, depositing a
silicon nitride layer on the
oxide layer surface using an HCD process. This invention, by depositing a
silicon nitride layer using the HCD process, not only avoids lattice damage caused by
plasma in existing deposition processes, but also, due to the high process temperature and long
processing time of the HCD process, the prolonged and sufficiently high temperature heat treatment effectively improves the uniformity of implanted
ion distribution and lattice repair, thereby significantly improving WP performance by approximately 35%.