| 摘要 |
<p>A semiconductor device includes a semiconductor substrate including a cell area and a peripheral circuit area, a first trench for device isolation formed in the cell area of the semiconductor substrate and a second trench for device isolation formed within the semiconductor substrate of the peripheral circuit area to be deeper than the first trench, a device isolation layer buried within the first and second trenches for device isolation and having the same surface level as the semiconductor substrate in the cell area, a buried gate buried in the semiconductor substrate of the cell area, and a peripheral circuit gate which is in contact with the semiconductor substrate of the peripheral circuit area, is buried within the device isolation layer of the peripheral circuit area, and has the same surface level as the buried gate. It can prevent the same effect from affecting the cell area and the peripheral circuit area so that the number of masks is reduced and the process is simplified so that cost can be reduced and characteristics of the semiconductor device can be improved.</p> |
