Patent ID: 7285468

Claim:
A DRAM forming method comprising: forming a first gate stack and a second gate stack over a substrate, each gate stack comprising a pair of opposing sidewalls; defining a first, second, third and fourth diffusion regions within the substrate; defining an isolation region between the first gate stack and the second gate stack, the isolation region electrically isolating the first and second gate stacks from each other; forming a pair of spacers along opposing sidewalls of each gate stack; the first and second diffusion regions extending an initial distance under the spacers associated with the first gate stack, and the third and fourth diffusion regions extending an initial distance under the spacers associated with the second gate stack; extending the first diffusion region relative to the initial distance without extending the second diffusion region, the extending comprising implanting a heavy p-type dopant; and extending the fourth diffusion region relative to the initial distance without extending the third diffusion region.