Method for manufacturing thin film transistor and thin film transistor

Abstract

A low-temperature poly-silicon thin film transistor and a manufacturing method therefor. The method comprises: carrying out an etching operation on a gate metal layer by using a photoresist pattern (105) to form a gate intermediate pattern (106), the size of the gate intermediate pattern (106) being greater than the size of a gate target pattern (101); carrying out shielding by using the photoresist pattern (105), and forming an n+ region (1041) in a poly-silicon layer (104); removing a redundant part, relative to the gate target pattern (101), of the gate intermediate pattern (106) by using a dry etching technology, so as to obtain the gate target pattern (101); and carrying out shielding by using the gate target pattern (101), and forming an n- region (1042) in the poly-silicon layer. The precision of the n- region of the manufactured thin film transistor can meet requirements for accurate control of the low-temperature poly-silicon thin film transistor over the size of an LDD structure, and the manufacturing technological process of the LTPS TFF is simplified.

Description

technical field [0001] The invention relates to a thin-film transistor, in particular to a method for manufacturing a low-temperature polysilicon thin-film transistor and the low-temperature polysilicon thin-film transistor. Background technique [0002] Thin Film Transistor Liquid Crystal Display (TFTLD) can be divided into polysilicon and amorphous silicon, the difference between the two lies in the characteristics of the transistor. The molecular structure of polysilicon is arranged in a neat and directional manner in a crystal grain, so the electron mobility of polysilicon is higher than that of disordered amorphous silicon, so it has been widely used. [0003] Polysilicon mainly includes high-temperature polysilicon and low-temperature polysilicon. [0004] TFTs made of low-temperature polysilicon are divided into two types: N-type and P-type. N-type low-temperature polysilicon TFTs need to be provided with a low-doped drain (Lightly Drain Doping, LDD) to reduce the le...

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Problems solved by technology

[0014] However, there is no better solution in the prior art to better control the size of the LDD structure

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