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Samsung 32GB NAND flash memory

Ilse Jurrien
Photokina report
Tuesday 12th, September 2006
Posted by: Ilse Jurrien

Samsung Electronics announced that it has developed the industry’s first 40-nanometer (nm) memory device. The Samsung 32 Gigabit (Gb) NAND flash device is the first memory to incorporate a Charge Trap Flash (CTF) architecture, a revolutionary new approach to further increase manufacturing efficiency while greatly improving performance. The new CTF-based NAND 32GB flash memory increases the reliability of the memory by sharply reducing inter-cell noise levels. Its surprisingly simple structure also enables higher scalability which will eventually improve manufacturing process technology from 40 nm to 30 and even 20nm. The 32Gb CTF memory was announced at the Samsung press conference in Seoul.

Samsung 64GB CF

Samsung NAND Flash memory
In each 32Gb device, the control gate in the CTF is only 20% as large as a conventional control gate in a typical floating gate structure. With CTF, there is no floating gate. Instead, the data is temporarily placed in a “holding chamber” of the non-conductive layer of the flash memory composed of silicon nitride (SiN). This results in a higher level of reliability and better control of the storage current. The 32Gb NAND flash memory can be used in memory cards with densities of up to 64GB. One 64GB card can store over 64 hours of DVD resolution movies or 16,000 MP3 music files.

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Samsung NAND Flash - Architecture
The CTF design is enabled through the use of a TANOS structure comprised of tantalum (metal), aluminum oxide (high k material), nitride, oxide and silicon. The use of a TANOS structure marks the first application of a metal layer coupled with a high k material to the NAND device. The TANOS CTF architecture, which serves as the foundation of the 40nm 32Gb CTF NAND flash announced today, was developed after extensive research of the Samsung Semiconductor R&D department. Samsung first revealed the TANOS structure through a paper at the 2003 International Electron Devices Meeting (IEDM).

Samsung 64GB flash memory - Storage capacity
Introduction of a 40nm manufacturing process for 32Gb NAND flash marks the seventh generation of NAND flash that follows the New Memory Growth Theory of double-density growth every 12 months, which was first presented by Dr. Chang Gyu Hwang, president and CEO of Samsung Electronics’ Semiconductor Business in a keynote address at ISSCC 2002.

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