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    • 5. 发明授权
    • Nonvolatile semiconductor storage device and manufacturing method thereof
    • 非易失性半导体存储装置及其制造方法
    • US07863134B2
    • 2011-01-04
    • US12695271
    • 2010-01-28
    • Hirotaka HamamuraItaru YanagiToshiyuki Mine
    • Hirotaka HamamuraItaru YanagiToshiyuki Mine
    • H01L21/336
    • H01L29/4234H01L21/28273H01L29/66825H01L29/792
    • A charge holding insulating film in a memory cell is constituted by a laminated film composed of a bottom insulating film, a charge storage film, and a top insulating film on a semiconductor substrate. Further, by performing a plasma nitriding treatment to the bottom insulating film, a nitride region whose nitrogen concentration has a peak value and is 1 atom % or more is formed on the upper surface side in the bottom insulating film. The thickness of the nitride region is set to 0.5 nm or more and 1.5 nm or less, and the peak value of nitrogen concentration is set to 5 atom % or more and 40 atom % or less, and a position of the peak value of nitrogen concentration is set within 2 nm from the upper surface of the bottom insulating film, thereby suppressing an interaction between the bottom insulating film and the charge storage film.
    • 存储单元中的电荷保持绝缘膜由半导体衬底上的底部绝缘膜,电荷存储膜和顶部绝缘膜构成的层叠膜构成。 此外,通过对底部绝缘膜进行等离子体氮化处理,在底部绝缘膜的上表面侧形成氮浓度为1原子%以上的氮化物区域。 将氮化物区域的厚度设定为0.5nm以上至1.5nm以下,将氮浓度的峰值设定为5原子%以上且40原子%以下,将氮的峰值的位置 浓度从底部绝缘膜的上表面设定在2nm以内,从而抑制底部绝缘膜与电荷存储膜之间的相互作用。
    • 10. 发明申请
    • SEMICONDUCTOR DEVICE
    • 半导体器件
    • US20080073705A1
    • 2008-03-27
    • US11829248
    • 2007-07-27
    • Digh HISAMOTOItaru YanagiYasuhiro ShimamotoToshiyuki MineYutaka Okuyama
    • Digh HISAMOTOItaru YanagiYasuhiro ShimamotoToshiyuki MineYutaka Okuyama
    • H01L29/792
    • H01L29/792G11C16/0425G11C16/10H01L27/115H01L27/11568H01L29/66833
    • A gate dielectric functioning as a charge-trapping layer of a non-volatile memory cell with a structure of an insulator gate field effect transistor is formed by laminating a first insulator formed of a silicon oxide film, a second insulator formed of a silicon nitride film, a third insulator formed of a silicon nitride film containing oxygen, and a fourth insulator formed of a silicon oxide film in this order on a main surface of a semiconductor substrate. Holes are injected into the charge-trapping layer from a gate electrode side. Accordingly, since the operations can be achieved without the penetration of the holes through the interface in contact to the channel and the first insulator, the deterioration in rewriting endurance and the charge-trapping characteristics due to the deterioration of the first insulator does not occur, and highly efficient rewriting (writing and erasing) characteristics and stable charge-trapping characteristics can be achieved.
    • 作为具有绝缘体栅极场效应晶体管的结构的非易失性存储单元的电荷捕获层的栅极介质通过层叠由氧化硅膜形成的第一绝缘体,由氮化硅膜形成的第二绝缘体 由半导体衬底的主表面依次由含有氧的氮化硅膜构成的第三绝缘体和由氧化硅膜形成的第四绝缘体构成。 孔从栅电极侧注入电荷捕获层。 因此,由于可以在没有孔穿过与沟道和第一绝缘体接触的界面的情况下实现操作,所以不会发生由于第一绝缘体的劣化导致的重写耐久性和电荷捕获特性的劣化, 并且可以实现高效的重写(写入和擦除)特性和稳定的电荷捕获特性。