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    • 39. 发明授权
    • Nonvolatile memory device for storing multi-bit data
    • 用于存储多位数据的非易失性存储器件
    • US07462529B2
    • 2008-12-09
    • US11386686
    • 2006-03-23
    • Tsutomu Nakai
    • Tsutomu Nakai
    • H01L21/8238
    • H01L29/66833H01L21/28282H01L29/42352H01L29/792H01L29/7923
    • A semiconductor nonvolatile memory device for storing multi-bit data has a memory cell having a source region S and a drain region D formed at the surface of a semiconductor substrate, a gate insulator film and a control gate CG formed on a channel region CH between the source region S and the drain region D and a nonconductive trap gate in the gate insulator film. An indentation is provided at the surface of the semiconductor substrate covering a region from a position in the vicinity of the drain region in the channel region to the drain region. By providing the indentation on the drain region side of the channel region, the trap gate is positioned in the direction of a channel current flowing from the source region S to the drain region D. Then, a charge having run through the channel region CH is injected efficiently into the trap gate on the indentation.
    • 用于存储多位数据的半导体非易失性存储器件具有存储单元,其具有形成在半导体衬底的表面处的源极区域S和漏极区域D,栅极绝缘膜和控制栅极CG,栅极绝缘膜和控制栅极CG形成在沟道区域CH之间, 源极区S和漏极区D以及栅极绝缘膜中的非导电陷阱栅极。 在半导体衬底的表面上设置有一个凹槽,该凹槽覆盖从沟道区域中的漏极区域附近的位置到漏极区域的区域。 通过在沟道区域的漏极区侧设置凹陷,阱栅位于从源极区域S流到漏极区域D的沟道电流的方向上。然后,穿过沟道区域CH的电荷为 有效地注入压痕中的陷阱门。
    • 40. 发明申请
    • FLASH MEMORY DEVICE AND FABRICATING METHOD THEREOF
    • 闪存存储器件及其制造方法
    • US20080258199A1
    • 2008-10-23
    • US11736114
    • 2007-04-17
    • Jong-Ho Lee
    • Jong-Ho Lee
    • H01L29/788H01L21/04
    • H01L29/66833B82Y10/00H01L21/28273H01L21/28282H01L29/42332H01L29/42336H01L29/42348H01L29/42352H01L29/66825H01L29/785H01L29/7881H01L29/7887H01L29/792H01L29/7923
    • The present invention relates to a flash memory device and its fabrication method, in more detail, it relates to a novel device structure for improving a scaling-down characteristic/performance and increasing memory capacity of the MOS-based flash memory device.A new device structure according to the present invention is compatible with existing fabrication process and is based on a recessed channel, which is capable of easily implementing highly-integrated/high-performance and 2-bit/cell. The proposed device has a structure suppressing the short channel effect while largely reducing the cell area and enabling 2-bit/cell by forming the charge storage node as a spacer inside the recessed channel. Moreover, if selectively removing the dielectric films around the recessed silicon surface, the sides as well as the surface of the recessed channel is exposed. A spacer can be also made in this situation and used for a storage node, thereby improving the channel controllability of the control electrode and the on-off characteristic of a device. The proposed structure also takes advantage of resolving the threshold voltage problem and improving the write/erase speeds.
    • 本发明涉及闪速存储器件及其制造方法,更详细地说,涉及一种用于改善按比例缩小特性/性能并增加基于MOS的闪存器件的存储器容量的新型器件结构。 根据本发明的新器件结构与现有制造工艺兼容,并且基于能够容易地实现高度集成/高性能和2位/单元的凹陷通道。 所提出的装置具有抑制短信道效应的结构,同时通过在凹陷通道内形成作为间隔物的电荷存储节点,大大减小了单元面积并使得能够实现2位/单元。 此外,如果选择性地去除凹陷硅表面周围的电介质膜,则侧面以及凹槽的表面被暴露。 在这种情况下也可以制造间隔物,用于存储节点,从而提高控制电极的通道可控性和装置的开 - 关特性。 所提出的结构还利用解决阈值电压问题并提高写/擦除速度。