Abstract:
CMP (chemical/mechanical polishing) slurries that can rapidly remove a target layer and can effectively passivate a polishing stopper, with high selectivity. In one aspect, a CMP slurry comprises metal oxide abrasive particles, a removal rate accelerator, an anionic polymeric passivation agent having a molecular weight in a range of about 1,000 to about 100,000, a C1-C12 anionic passivation agent, and water.
Abstract:
A method for isolating SAC pads of a semiconductor device, including determining a chemical mechanical polishing process time necessary to isolate the SAC pads a desired amount by referring to a relationship equation between the extent of isolation of the self-aligned contact pads and the chemical-mechanical polishing process time. The chemical mechanical polishing process is performed for the determined process time on the semiconductor device to isolate the self-aligned contact pads the desired amount. The relationship equation is determined using a test semiconductor device.
Abstract:
A CMOS image sensor containing a plurality of unit pixels, each unit pixel having a light sensing region and a peripheral circuit region, includes: a semiconductor substrate of a first conductive type; a transistor formed on the peripheral circuit region of the semiconductor substrate, wherein the transistor has a gate oxide layer and a gate electrode formed on the gate oxide layer; spacers formed on sidewalls of the gate oxide layer and the gate electrode, wherein one spacer are formed on the light sensing region; a first doping region of a second conductive type formed on the light sensing region, wherein the first doping region is extended to an edge of the gate electrode; and a second doping region of the first conductive type formed on the first doping region, wherein the second doping region is extended to an edge of a spacer formed on the light sensing region.