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Flash memory cell and method of forming same

A flash memory unit and semiconductor technology, applied in electrical components, information storage, static memory, etc., can solve problems such as unstable storage performance of flash memory units, and achieve the effect of improving reliability

Active Publication Date: 2015-12-09
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem solved by the present invention is to provide a flash memory unit and its forming method to solve the problem of unstable storage performance of the existing flash memory unit

Method used

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  • Flash memory cell and method of forming same
  • Flash memory cell and method of forming same
  • Flash memory cell and method of forming same

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Embodiment Construction

[0035] It can be known from the background art that the storage performance of the existing flash memory unit will decrease after being programmed many times. The inventors conducted research on the above problems and found that when programming the existing flash memory cells, under the joint action of the drain voltage applied to the drain and the gate voltage applied to the control gate, hot electrons flow from the source to the control gate. The drain migrates and is implanted into the floating gate through the tunnel oxide as it moves. In the process of injecting hot electrons into the floating gate, most of the hot electrons cross to the floating gate from the part of the tunnel oxide layer close to the drain or facing the drain, and the hot electrons are easy to be damaged during multiple programming operations. The part of the tunnel oxide layer close to the drain or facing the drain causes damage, such as stress effects and trap charges; in subsequent programming, the...

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Abstract

The technical scheme of the invention provides a flash memory, which comprises a semiconductor substrate, a grid structure, a source and a drain, wherein the grid is positioned on the surface of the semiconductor and comprises a tunneling oxide layer, a floating grid, an isolated oxide layer and a control grid; the source and the drain are positioned in the semiconductor at two sides of the grid structure; and the doping type of one end of the floating grid, which is close to the drain, is P-type, and the doping type of the other parts of the floating grid is n-type. The technical scheme of the invention also provides a method for forming the flash memory. The flash memory provided by the invention has better reliability.

Description

technical field [0001] The invention relates to a semiconductor device and its forming method, in particular to a flash memory unit and its forming method. Background technique [0002] In the current semiconductor industry, integrated circuit products can be mainly divided into three types: analog circuits, digital circuits and digital / analog hybrid circuits, among which storage devices are an important type of digital circuits. In recent years, among storage devices, flash memory (flash memory, flash memory unit for short) has developed particularly rapidly. The main feature of the flash memory unit is that it can keep the stored information for a long time without power on; and it has the advantages of high integration, fast access speed, easy erasing and rewriting, etc. Has been widely used. [0003] The structure of the flash memory cell is different from that of conventional MOS transistors. The gate (gate) of a conventional MOS transistor and the conductive channel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/115H01L29/10H01L21/8247G11C16/04
Inventor 曹子贵
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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