Patent ID: 9472445
Filing Date: 2016-10-18
CPC Classification: H01L

Claim Text:
1. A semiconductor memory device, comprising: a substrate including a first region and a second region; a first element isolation film pattern in the first region to define a first active region, the first element isolation film pattern being in a first trench; a second element isolation film pattern in the second region to define a second active region, the second element isolation film pattern being in a second trench; a first sidewall protection film on sidewalls of the first and second trenches; and a second sidewall protection film on the first sidewall protection film, wherein the first element isolation film pattern includes a first material and the second element isolation film pattern includes a second material different from the first material, and the first sidewall protection film and the second sidewall protection film include different materials from each other, and wherein the first material is an oxide and the second material is a nitride or the first material is a nitride and the second material is an oxide.