Samsung Electronics Co., Ltd.

Chang-sik Choi

Hyo-dong Ban

Hyun-cheol Choe

Hong-Ki Kim

Duck-hyung Lee

A method for manufacturing a semiconductor memory device in which a bit line and a storage electrode of a capacitor are connected to an active area of a semiconductor substrate, respectively, via a contact pad formed in a self-aligning manner. The method includes the steps of forming gate electrodes on the semiconductor substrate, the gate electrodes being covered with a nitride spacer. Then, a thermal oxide layer is formed on the exposed surface of the semiconductor substrate between the gate electrodes. Then, an etch stop layer is formed on the entire surface of the resultant structure having the thermal oxide layer to an appropriate thickness such that the space between the gate electrodes is not buried. Then, a first interlayer dielectric (ILD) film covering the space between the gate electrodes and the top of the gate electrodes is formed, and the first ILD film is then patterned to form a landing pad hole which exposes the spacer and the etch stop layer. Then, the etch stop layer and the thermal oxide layer are removed to expose the surface of the semiconductor substrate, and the landing pad hole is then filled with a conductive material to form landing pads.

Integrated circuit memory devices having self-aligned contact

Method for manufacturing semiconductor device having self-aligned contact

Integrated circuit memory devices are fabricated by fabricating an array of memory cell field effect transistors and peripheral circuit field effect transistors that are spaced-apart from the memory cell transistors, in an integrated circuit substrate. The memory cell transistors include spaced-apart memory cell transistor source and drain regions and a memory cell gate therebetween. The peripheral circuit transistors include spaced-apart peripheral circuit transistor source and drain regions and a peripheral circuit gate therebetween. A silicide blocking layer is formed on the memory cell transistor source and drain regions. The integrated circuit substrate is silicided to thereby form a silicide layer on the memory cell transistor gates, on the peripheral circuit source and drain regions and on the peripheral circuit gates, such that the memory cell transistor source and drain regions are free of the silicide layer thereon. Accordingly, low contact resistance silicide regions may be selectively provided in memory cells without degrading the leakage characteristics thereof.

Growing community of inventors

Kyungki-do, South Korea

Chang-sik Choi