Shanghai Huali Integrated Circuit Corporation

Yenchan Chiu

Chanyuan Hu

Liyao Liu

Yingju Chen

A method for cutting off a fin in a field effect transistor, comprising: stepforming fins and first spacing regions, there are two types of fins&#x2014;the first type is configured to be cut off and a second type is configured to be reserved; and forming a first material layer to fill the first spacing regions; stepforming a first pattern structure comprising first strip structures aligning to one first type fin and second spacing regions; stepforming second sidewalls on two sides of each first strip structure; stepremoving the first strip structures to form a second pattern structure by the second sidewalls; stepetching away the first material layer and the first type of fins by using the second sidewalls as a mask ; stepremoving the second sidewalls and the remaining first material layer. The present application enables using less advanced lithography equipment.

Method for cutting off FIN field effect transistor

The present disclosure discloses a FinFET transistor cut etching process method, comprising: step 1, forming a first photoresist pattern to define a cut etching region of the FinFET transistor; step 2, forming a second amorphous semiconductor pattern; step 3, forming a first dielectric layer and a first groove; step 4, forming a second dielectric layer that fully fills the first groove; step 5, performing CMP using the second amorphous semiconductor layer as a stop layer, so as to form a sidewall and a second dielectric layer strip; step 6, performing self-alignment to remove each side wall; step 7, performing a wet process to remove the amorphous semiconductor strip; and step 8: performing etching by using each second dielectric layer strip as a mask, so as to form a fin and achieve cut etching of the FinFET transistor. The present disclosure can enlarge the process window and reduce the process cost.

FinFET transistor cut etching process method

The disclosure provides a method for making a self-aligned double pattern, A silicon substrate with a first oxide layer, an amorphous silicon layer and an organic layer, etching the organic layer and the amorphous silicon layer, and covering them with a first silicon nitride layer; remove the first silicon nitride layer in the amorphous silicon pattern, forming first silicon nitride sidewall patterns on the amorphous silicon pattern's sidewalls; removing the amorphous silicon pattern between the first silicon nitride sidewall patterns; defining the morphology of a fin field-effect transistor, form core patterns and covering them with a thin silicon nitride layer; depositing a second oxide layer; defining the fin field-effect transistor's height, and etching back the second oxide layer till the height of the core patterns satisfies the defined fin field-effect transistor height; removing the thin silicon nitride layer, depositing a third oxide layer to cover the core patterns.

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Shanghai, China

Yenchan Chiu