发明名称 |
Extreme ultraviolet lithography process to print low pattern density features |
摘要 |
The present disclosure provides a method for extreme ultraviolet lithography (EUVL) process. The method includes loading a binary phase mask (BPM) to a lithography system, wherein the BPM includes two phase states and defines an integrated circuit (IC) pattern thereon; setting an illuminator of the lithography system in an illumination mode according to the IC pattern; configuring a pupil filter in the lithography system according to the illumination mode; and performing a lithography exposure process to a target with the BPM and the pupil filter by the lithography system in the illumination mode. |
申请公布号 |
US9535334(B2) |
申请公布日期 |
2017.01.03 |
申请号 |
US201414289474 |
申请日期 |
2014.05.28 |
申请人 |
Taiwan Semiconductor Manufacturing Company, Ltd. |
发明人 |
Lu Yen-Cheng;Yu Shinn-Sheng;Chen Jeng-Horng;Yen Anthony |
分类号 |
G03B27/32;G03B27/54;G03B27/72;G03F1/00;G03F7/20;G03F1/24;G03F1/26 |
主分类号 |
G03B27/32 |
代理机构 |
Haynes and Boone, LLP |
代理人 |
Haynes and Boone, LLP |
主权项 |
1. A method for extreme ultraviolet lithography (EUVL) process, comprising:
loading a binary phase mask (BPM) to a lithography system, wherein the BPM includes two phase states and defines an integrated circuit (IC) pattern thereon, wherein the BPM includes a first phase state of the two phase states at a greater occurrence than a second phase state of the two phase states; setting an illuminator of the lithography system in an illumination mode according to the IC pattern; providing EUV light from the illuminator in the illumination mode to the BPM; reflecting the EUV light from the BPM configuring a pupil filter in the lithography system according to the illumination mode; using the pupil filter, filtering out a non-diffracted component of the reflected EUV light from the first state and the second state, wherein an average amplitude of the filtered non-diffracted component is substantially near an amplitude of EUV light reflected from the first state; increasing an amplitude of a diffracted component of the reflective EUV light, wherein the amplitude of the reflected EUV light diffracted from the second state is approximately doubled after the filtering; and exposing a photoresist layer with the diffracted component having the increased amplitude. |
地址 |
Hsin-Chu TW |