Method for enhancing read-in speed of floating body effect storage unit and semiconductor device

Abstract

The invention provides a manufacturing method for enhancing read-in speed of a floating body effect storage unit and an intermediate transitional semiconductor device, which belong to the technical field of semiconductor manufacture. The core of the invention is that: a side wall material is deposited, and inclination plasma surface processing is conducted on the side wall material, so that the surface characteristics of the top of the side wall material and the side part close to a source electrode of the side wall material are changed, and the side part close to a drain electrode of the side wall material is not changed; the side wall material is etched to form a side wall, and the width of the side wall close to the source electrode is larger than that of the side wall close to the drain electrode; and the side wall is taken as a mask, heavy doping and annealing process are conducted to form the source electrode and the drain electrode, the distance between doped ion of the drain electrode and a channel is reduced, and the distance between doped ion of the source electrode and a liner is increased. In the invention, a longitudinal electric field in the channel of the drain electrode is improved on one hand, and the current of the liner is increased, and on the other hand, the leaking speed of accumulated current carriers is reduced from the source electrode, so that the read-in speed of the floating body effect storage unit is improved.

Description

technical field [0001] The invention relates to the technical field of semiconductor manufacturing, in particular to a manufacturing method and an intermediate transition semiconductor device capable of improving the writing speed of a floating body effect memory cell. Background technique [0002] The development of embedded dynamic memory technology has made a large-capacity dynamic random access memory (Dynamic Random Access Memory, that is, DRAM) very common in current system-on-a-chip (System on a Chip, that is, SoC). Large-capacity embedded DRAM brings various benefits to SoCs, such as improved bandwidth and reduced power consumption, that can only be achieved through the use of embedded technology. In addition to transistors, each memory cell of traditional embedded dynamic random access memory (eDRAM) requires a deep trench capacitor structure. The deep trench of the capacitor makes the height of the memory cell larger than its width. It is much larger, which makes ...

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Problems solved by technology

[0005] When the floating body effect memory cell is writing "1", the carriers will accumulate in the substrate while slowly leaking from the source. The inventor believes that the writing speed of the floating body effect memory cell ("1") has yet to be reached improve

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